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Schedule of Reconciliation of Obligations and Fair Values of Plan Assets (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |  |
Benefit Obligation at April 1, |  | $ 40,589 | $ 42,281 |
Service Cost - Benefits Earned During the Period |  | 710 | 1,001 | $ 1,039
Interest Cost on Projected Benefit Obligation |  | 1,466 | 1,584 | 1,525
Amendments |  |  | 199 |
Actuarial (Gain) Loss |  | (4,505) | (3,531) |
Settlement | $ (3,900) | (3,857) |  |
Benefits Paid |  | (1,033) | (945) |
Benefit Obligation at March 31, | 33,370 | 33,370 | 40,589 | 42,281
Fair Value of Plan Assets at April 1, |  | 26,410 | 21,424 |
Actual Return on Plan Assets |  | 2,805 | 2,522 |
Employer Contributions |  | 9,087 | 3,409 |
Settlement |  | (3,857) |  |
Benefits Paid |  | (1,033) | (945) |
Fair Value of Plans at March 31, | 33,412 | 33,412 | 26,410 | $ 21,424
Funded (Unfunded) Status at March 31, | 42 | 42 | (14,179) |
Prepaid and Other Assets | 538 | 538 |  |
Accrued Benefit Liability | (496) | (496) | (14,179) |
Accumulated Other Comprehensive Losses: | 5,278 | 5,278 | 11,936 |
Accumulated Other Comprehensive Losses - Net Actuarial Loss | 5,198 | 5,198 | 11,587 |
Accumulated Other Comprehensive Losses - Prior Service Cost | 80 | 80 | 349 |
Accumulated Other Comprehensive Losses | 5,278 | 5,278 | 11,936 |
Reclassification to Retained Earnings | 978 | 978 |  |
Tax impact | (2,244) | (2,244) | (4,540) |
Accumulated Other Comprehensive Losses, net of tax | $ 4,012 | $ 4,012 | $ 7,396 |

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