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Changes in Accumulated Other Comprehensive Loss - The Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before provision for income taxes | $ 6,272 | $ 3,846 | $ 9,898 | $ 9,464 |
| Provision for income taxes | 2,086 | 1,257 | 3,320 | 3,067 |
| Net income | 4,186 | 2,589 | 6,578 | 6,397 |
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Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Prior Service Benefit [Member]
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before provision for income taxes | 26 | 41 | 51 | 81 |
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Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Amortization of Actuarial Loss [Member]
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before provision for income taxes | (155) | (262) | (310) | (523) |
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Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Pension and Other Postretirement Benefits Items [Member]
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before provision for income taxes | (129) | (221) | (259) | (442) |
| Provision for income taxes | (45) | (78) | (91) | (156) |
| Net income | $ (84) | $ (143) | $ (168) | $ (286) |