Purchase of Treasury Stock - Additional Information (Detail) - USD ($) |
12 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
Jan. 29, 2015 |
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| Equity [Abstract] | ||||
| Stock repurchase program authorized amount | $ 18,000,000 | |||
| Number of shares purchased during period | 0 | 0 | 539,000 | |
| Aggregate cost of shares purchased during period | $ 119,000 | $ 29,000 | $ 9,441,000 | |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of stock repurchase plan authorized. No definition available.
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| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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