Balance Sheet Information - Summary of Estimated Fair Value of Investments in Marketable Debt Securities (Detail) $ in Thousands |
May 31, 2016
USD ($)
|
|---|---|
| Balance Sheet Information [Abstract] | |
| Due in 1 year | $ 10,432 |
| Due in 1 year through 5 years | 22,147 |
| Due in 5 years through 10 years | 1,372 |
| Due after 10 years | 3,471 |
| Total | $ 37,422 |