Fair Value of Stock Options Granted, Estimated using Weighted-Average Assumptions (Detail) |
12 Months Ended | |
---|---|---|
May. 31, 2016 |
May. 31, 2015 |
|
Schedule of Weighted Average Assumptions for Fair Values of Stock Options [Line Items] | ||
Risk-free interest rate | 1.20% | |
Expected dividend yield | 0.00% | |
Expected stock price volatility | 36.20% | |
Expected option life (in years) | 4 years | |
During fiscal 2016 | ||
Schedule of Weighted Average Assumptions for Fair Values of Stock Options [Line Items] | ||
Risk-free interest rate | 1.20% | |
Expected dividend yield | 0.00% | |
Expected stock price volatility | 33.30% | |
Expected option life (in years) | 4 years |