Discontinued Operations - Additional Information (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jun. 04, 2014 |
Jan. 31, 2016 |
Jan. 31, 2015 |
Jan. 31, 2016 |
Jan. 31, 2015 |
|
| Discontinued Operations and Disposal Groups [Abstract] | |||||
| Proceeds from disposition | $ 30,000,000 | $ 30,000,000 | |||
| Amount that will be placed into escrow as partial security for the Company's indemnification obligations | $ 4,500,000 | ||||
| Loss on disposal of discontinued operations, net of tax, recognized in current period | $ 0 | $ 0 | $ 0 | $ (1,537,000) | |
| Assets held for sale | 0 | 0 | |||
| Claims for indemnification received | $ 0 | $ 0 | |||