Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details 11)

v2.4.0.6
Employee Benefit Plans (Details 11) (Other postretirement benefit plans [Member])
Mar. 31, 2013
Mar. 31, 2012
Other postretirement benefit plans [Member]
   
Weighted average actuarial assumptions used to develop the projected benefit obligation    
Discount rate 3.26% 3.96%
Medical care cost trend rate 8.00% 8.00%