Goodwill and Other Intangible Assets - Changes in Net Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
May 31, 2016 |
Feb. 29, 2016 |
|
| Goodwill and Intangible Assets Disclosure [Abstract] | ||
| Goodwill, Beginning balance | $ 64,537 | $ 64,489 |
| Goodwill acquired | 48 | |
| Goodwill impairment | 0 | 0 |
| Goodwill, Ending balance | $ 64,537 | $ 64,537 |