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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Unrealized gains(losses) on available-for-sale securities, tax | $ (239) | $ 0 | $ 115
Amortization of loss on derivative contract, tax | 77 | 0 | 251
Change in supplemental executive retirement plan pension liability, tax | 1,264 | 0 | 409
Change in Pension Plan minimum liability, tax | 1,093 | 0 | 763
Change in Other Benefit Plan minimum liability, tax | $ 5,081 | $ (769) | $ 1,109

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