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Income Taxes - Summary of Income Tax Provision (Detail) - USD ($) | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Current — Federal | $ 11,177,000 | $ 16,456,000 | $ 16,600,000
Current — State | 1,905,000 | 2,834,000 | 2,591,000
Subtotal | 13,082,000 | 19,290,000 | 19,191,000
Deferred — Federal | (955,000) | (1,508,000) | (1,679,000)
Deferred — State | 81,000 | 288,000 | 23,000
Subtotal | (874,000) | (1,220,000) | (1,656,000)
Total | $ 12,208,000 | $ 18,070,000 | $ 17,535,000

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