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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Feb. 28, 2017 | May 31, 2016
Accounting Policies [Abstract] |  |  |
Deferred debt cost, Current |  |  | $ 3.0
Deferred debt costs, long term net |  |  | $ 8.2
Discrete tax benefits for excess tax benefits related to equity compensation | $ 0.2 | $ 11.5 |

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