|
Employee Benefit Plans (Tables)
|
12 Months Ended |
|
Mar. 31, 2013
|
| Defined Benefit Plan Disclosure [Line Items] |
|
| Summary of weighted average asset allocation of the plan assets by asset category |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Target
Allocation |
|
|
March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Asset Category
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Equity securities
|
|
|
50-70 |
% |
|
|
68 |
% |
|
|
67 |
% |
|
Debt securities
|
|
|
20-50 |
% |
|
|
32 |
% |
|
|
33 |
% |
|
Other, including cash
|
|
|
0-10 |
% |
|
|
— |
% |
|
|
— |
% |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
100 |
% |
|
|
100 |
% |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Pension plans, defined benefit [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
| Components of postretirement benefit income and pension cost |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Year ended March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
2011 |
|
|
Service cost during the period
|
|
$ |
544 |
|
|
$ |
459 |
|
|
$ |
384 |
|
|
Interest cost on projected benefit obligation
|
|
|
1,427 |
|
|
|
1,421 |
|
|
|
1,340 |
|
|
Expected return on assets
|
|
|
(2,738 |
) |
|
|
(2,713 |
) |
|
|
(2,499 |
) |
|
Amortization of:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unrecognized prior service cost
|
|
|
4 |
|
|
|
4 |
|
|
|
4 |
|
|
Actuarial loss
|
|
|
1,011 |
|
|
|
517 |
|
|
|
421 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Net pension cost (benefit)
|
|
$ |
248 |
|
|
$ |
(312 |
) |
|
$ |
(350 |
) |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Weighted average actuarial assumptions used to determine net pension cost |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Year ended March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
2011 |
|
|
Discount rate
|
|
|
4.76 |
% |
|
|
5.63 |
% |
|
|
6.07 |
% |
|
Rate of increase in compensation levels
|
|
|
3.50 |
% |
|
|
3.50 |
% |
|
|
3.50 |
% |
|
Long-term rate of return on plan assets
|
|
|
8.50 |
% |
|
|
8.50 |
% |
|
|
8.50 |
% |
|
| Changes in the Company's benefit obligation, plan assets and funded status for the plan |
| |
|
|
|
|
|
|
|
|
| |
|
Year ended March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Change in the benefit obligation
|
|
|
|
|
|
|
|
|
|
Projected benefit obligation at beginning of year
|
|
$ |
30,430 |
|
|
$ |
25,688 |
|
|
Service cost
|
|
|
439 |
|
|
|
354 |
|
|
Interest cost
|
|
|
1,427 |
|
|
|
1,421 |
|
|
Actuarial loss
|
|
|
1,561 |
|
|
|
3,889 |
|
|
Benefit payments
|
|
|
(1,579 |
) |
|
|
(922 |
) |
| |
|
|
|
|
|
|
|
|
|
Projected benefit obligation at end of year
|
|
$ |
32,278 |
|
|
$ |
30,430 |
|
| |
|
|
|
|
|
|
|
|
|
| Summary of amounts recognized in accumulated other comprehensive loss, net of income tax |
| |
|
|
|
|
|
|
|
|
| |
|
March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Net actuarial losses
|
|
$ |
8,278 |
|
|
$ |
8,508 |
|
|
Prior service cost
|
|
|
5 |
|
|
|
7 |
|
| |
|
|
|
|
|
|
|
|
| |
|
$ |
8,283 |
|
|
$ |
8,515 |
|
| |
|
|
|
|
|
|
|
|
|
| Summary of increase/decrease in accumulated other comprehensive loss (income), net of income tax |
| |
|
|
|
|
|
|
|
|
| |
|
March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Net actuarial loss arising during the year
|
|
$ |
424 |
|
|
$ |
3,434 |
|
|
Amortization of actuarial loss
|
|
|
(653 |
) |
|
|
(334 |
) |
|
Amortization of prior service cost
|
|
|
(3 |
) |
|
|
(3 |
) |
| |
|
|
|
|
|
|
|
|
| |
|
$ |
(232 |
) |
|
$ |
3,097 |
|
| |
|
|
|
|
|
|
|
|
|
| Summary of benefit payments, which reflect future service, are expected to be paid |
| |
|
|
|
|
|
2014
|
|
$ |
1,184 |
|
|
2015
|
|
|
1,244 |
|
|
2016
|
|
|
1,230 |
|
|
2017
|
|
|
1,331 |
|
|
2018
|
|
|
1,416 |
|
|
2019-2023
|
|
|
8,030 |
|
| |
|
|
|
|
|
Total
|
|
$ |
14,435 |
|
| |
|
|
|
|
|
| Summary of weighted average asset allocation of the plan assets by asset category |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
Fair Value Measurements Using |
|
|
Asset Category
|
|
At
March 31,
2013
|
|
|
Quoted prices in
active markets for
identical assets
(Level 1) |
|
|
Significant other
observable inputs
(Level 2) |
|
|
Significant
unobservable inputs
(Level 3) |
|
|
Cash
|
|
$ |
108 |
|
|
$ |
108 |
|
|
$ |
— |
|
|
$ |
— |
|
|
Equity securities:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. companies
|
|
|
19,209 |
|
|
|
19,209 |
|
|
|
— |
|
|
|
— |
|
|
International companies
|
|
|
4,284 |
|
|
|
4,284 |
|
|
|
— |
|
|
|
— |
|
|
Fixed income:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Corporate bond funds
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Intermediate-term
|
|
|
8,953 |
|
|
|
8,953 |
|
|
|
— |
|
|
|
— |
|
|
Short-term
|
|
|
2,073 |
|
|
|
2,073 |
|
|
|
— |
|
|
|
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
$ |
34,627 |
|
|
$ |
34,627 |
|
|
$ |
— |
|
|
$ |
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
Fair Value Measurements Using |
|
|
Asset Category
|
|
At
March 31,
2012
|
|
|
Quoted prices in
active markets for
identical assets
(Level 1) |
|
|
Significant other
observable inputs
(Level 2) |
|
|
Significant
unobservable inputs
(Level 3) |
|
|
Cash
|
|
$ |
80 |
|
|
$ |
80 |
|
|
$ |
— |
|
|
$ |
— |
|
|
Equity securities:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. companies
|
|
|
18,021 |
|
|
|
18,021 |
|
|
|
— |
|
|
|
— |
|
|
International companies
|
|
|
3,951 |
|
|
|
3,951 |
|
|
|
— |
|
|
|
— |
|
|
Fixed income:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Corporate bond funds
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Intermediate-term
|
|
|
8,577 |
|
|
|
8,577 |
|
|
|
— |
|
|
|
— |
|
|
Short-term
|
|
|
2,039 |
|
|
|
2,039 |
|
|
|
— |
|
|
|
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
$ |
32,668 |
|
|
$ |
32,668 |
|
|
$ |
— |
|
|
$ |
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Weighted average actuarial assumptions used to develop the projected benefit obligation |
| |
|
|
|
|
|
|
|
|
| |
|
March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Discount rate
|
|
|
4.28 |
% |
|
|
4.76 |
% |
|
Rate of increase in compensation levels
|
|
|
3.00 |
% |
|
|
3.50 |
% |
| |
|
|
|
Change in fair value of plan assets
Fair value of plan assets at beginning of year
|
|
$ |
32,668 |
|
|
$ |
32,368 |
|
|
Actual return on plan assets
|
|
|
3,538 |
|
|
|
1,222 |
|
|
Benefit and administrative expense payments
|
|
|
(1,579 |
) |
|
|
(922 |
) |
| |
|
|
|
|
|
|
|
|
|
Fair value of plan assets at end of year
|
|
$ |
34,627 |
|
|
$ |
32,668 |
|
| |
|
|
|
|
|
|
|
|
|
Funded status
|
|
|
|
|
|
|
|
|
|
Funded status at end of year
|
|
$ |
2,349 |
|
|
$ |
2,238 |
|
| |
|
|
|
|
|
|
|
|
|
Amount recognized in the Consolidated Balance Sheets
|
|
$ |
2,349 |
|
|
$ |
2,238 |
|
| |
|
|
|
|
|
|
|
|
|
|
Other postretirement benefit plans [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
| Components of postretirement benefit income and pension cost |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Year ended March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
2011 |
|
|
Interest cost on accumulated benefit obligation
|
|
$ |
39 |
|
|
$ |
45 |
|
|
$ |
50 |
|
|
Amortization of prior service benefit
|
|
|
(166 |
) |
|
|
(166 |
) |
|
|
(166 |
) |
|
Amortization of actuarial loss
|
|
|
44 |
|
|
|
37 |
|
|
|
34 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Net postretirement benefit income
|
|
$ |
(83 |
) |
|
$ |
(84 |
) |
|
$ |
(82 |
) |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Changes in the Company's benefit obligation, plan assets and funded status for the plan |
| |
|
|
|
|
|
|
|
|
| |
|
Year ended March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Change in the benefit obligation
|
|
|
|
|
|
|
|
|
|
Projected benefit obligation at beginning of year
|
|
$ |
999 |
|
|
$ |
999 |
|
|
Interest cost
|
|
|
39 |
|
|
|
45 |
|
|
Actuarial gain
|
|
|
95 |
|
|
|
66 |
|
|
Benefit payments
|
|
|
(103 |
) |
|
|
(111 |
) |
| |
|
|
|
|
|
|
|
|
|
Projected benefit obligation at end of year
|
|
$ |
1,030 |
|
|
$ |
999 |
|
| |
|
|
|
|
|
|
|
|
|
| Summary of amounts recognized in accumulated other comprehensive loss, net of income tax |
| |
|
|
|
|
|
|
|
|
| |
|
March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Net actuarial loss
|
|
$ |
336 |
|
|
$ |
303 |
|
|
Prior service cost
|
|
|
(176 |
) |
|
|
(283 |
) |
| |
|
|
|
|
|
|
|
|
| |
|
$ |
160 |
|
|
$ |
20 |
|
| |
|
|
|
|
|
|
|
|
|
| Summary of increase/decrease in accumulated other comprehensive loss (income), net of income tax |
| |
|
|
|
|
|
|
|
|
| |
|
March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Net actuarial loss arising during the year
|
|
$ |
61 |
|
|
$ |
43 |
|
|
Amortization of actuarial loss
|
|
|
(28 |
) |
|
|
(24 |
) |
|
Amortization of prior service cost
|
|
|
107 |
|
|
|
107 |
|
| |
|
|
|
|
|
|
|
|
| |
|
$ |
140 |
|
|
$ |
126 |
|
| |
|
|
|
|
|
|
|
|
|
| Summary of benefit payments, which reflect future service, are expected to be paid |
| |
|
|
|
|
|
2014
|
|
$ |
107 |
|
|
2015
|
|
|
102 |
|
|
2016
|
|
|
96 |
|
|
2017
|
|
|
91 |
|
|
2018
|
|
|
86 |
|
|
2019-2023
|
|
|
352 |
|
| |
|
|
|
|
|
Total
|
|
$ |
834 |
|
| |
|
|
|
|
|
| Weighted average actuarial assumptions used to develop the projected benefit obligation |
| |
|
|
|
|
|
|
|
|
| |
|
March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Discount rate
|
|
|
3.26 |
% |
|
|
3.96 |
% |
|
Medical care cost trend rate
|
|
|
8.00 |
% |
|
|
8.00 |
% |
|
| Change in fair value of plan assets |
| |
|
|
|
|
|
|
|
|
| |
|
Year ended March 31, |
|
| |
|
2013 |
|
|
2012 |
|
|
Change in fair value of plan assets
|
|
|
|
|
|
|
|
|
|
Fair value of plan assets at beginning of year
|
|
$ |
— |
|
|
$ |
— |
|
|
Employer contribution
|
|
|
103 |
|
|
|
111 |
|
|
Benefit payments
|
|
|
(103 |
) |
|
|
(111 |
) |
| |
|
|
|
|
|
|
|
|
|
Fair value of plan assets at end of year
|
|
$ |
— |
|
|
$ |
— |
|
| |
|
|
|
|
|
|
|
|
|
Funded status
|
|
|
|
|
|
|
|
|
|
Funded status at end of year
|
|
$ |
(1,030 |
) |
|
$ |
(999 |
) |
| |
|
|
|
|
|
|
|
|
|
Amount recognized in the Consolidated Balance Sheets
|
|
$ |
(1,030 |
) |
|
$ |
(999 |
) |
| |
|
|
|
|
|
|
|
|
|