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Stock-Based Compensation - Additional Information (Detail) (USD $)
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9 Months Ended |
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Feb. 28, 2014
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Non-Qualified Stock Options
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Non-qualified stock option, granted |
125,200 |
| Non-qualified stock option, per share price |
$ 31.89 |
| Non-qualified stock option, fair value, per share price |
$ 12.92 |
| Pre-tax stock-based compensation |
$ 1,482,000 |
| Pre-tax stock-based compensation, period of recognition |
3 years |
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Restricted Common Shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Pre-tax stock-based compensation, period of recognition |
3 years |
| Restricted common shares, granted |
370,340 |
| Restricted common shares, fair value per share |
$ 32.99 |
| Pre-tax stock-based compensation |
10,971,000 |
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Market-Based Restricted Common Shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted common shares, granted |
360,000 |
| Restricted common shares, fair value per share |
$ 24.19 |
| Pre-tax stock-based compensation |
$ 8,708,000 |
| Common share awards vesting, minimum price per share |
$ 50.00 |
| Common share awards vesting, minimum consecutive days at stated price |
30 |
| Service-based vesting condition period, years |
3 years |