Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
May 31, 2016 |
May 31, 2015 |
Feb. 29, 2016 |
|
| Finite-Lived Intangible Assets [Line Items] | |||
| Estimated useful life of asset | 9 years 2 months 12 days | 8 years 8 months 12 days | |
| Amortization of trade names, customer lists, and patent | $ 1,159,000 | $ 1,125,000 | |
| Goodwill acquired | $ 48,000 | ||
| Sovereign [Member] | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Goodwill acquired | $ 48,000 | ||
| Minimum [Member] | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Estimated useful life of asset | 1 year | ||
| Maximum [Member] | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Estimated useful life of asset | 15 years | ||