Schedule of Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
Pension Plan and Supplemental Plan
|
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Net Period Benefit Cost Assumptions [Line Items] | ||||
Service cost | $ 198 | $ 273 | $ 396 | $ 546 |
Interest cost | 895 | 1,072 | 1,790 | 2,144 |
Expected return on plan assets | (718) | (687) | (1,436) | (1,374) |
Amortization of prior service cost | 12 | 12 | 24 | 24 |
Recognized actuarial (gain) loss | 276 | 448 | 552 | 896 |
Net periodic benefit cost | 663 | 1,118 | 1,326 | 2,236 |
Other Benefits
|
||||
Net Period Benefit Cost Assumptions [Line Items] | ||||
Service cost | 101 | 119 | 202 | 238 |
Interest cost | 262 | 309 | 524 | 618 |
Amortization of prior service cost | (508) | (508) | (1,016) | (1,016) |
Recognized actuarial (gain) loss | (99) | (198) | ||
Net periodic benefit cost | $ (244) | $ (80) | $ (488) | $ (160) |