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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 22, 2017 | Dec. 21, 2017 | Feb. 28, 2018 | Nov. 30, 2017 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |
Corporate income tax rate |  | 21.00% | 35.00% |  |  |  |  |
Corporate tax rate reduction effective date | Jan. 01, 2018 |  |  |  |  |  |  |
Percentage of blended rate | 29.20% |  |  |  |  |  |  |
Discrete tax expense (benefit) |  |  |  | $ (1.4) | $ (27.0) |  | $ (1.4) |
Provisional income tax expense (benefit) |  |  |  |  |  |  | (24.1) |
Provisional income tax benefit for the partial reversal of existing deferred tax liabilities |  |  |  | 44.1 |  |  | 44.1 |
Partially offset provisional charge for the transition tax on previously deferred foreign earnings |  |  |  |  |  |  | 66.8 |
Provisional deferred tax liability adjustment |  |  |  | $ 44.1 |  |  | $ 44.1 |
Effective income tax expense rate |  |  |  | (17.00%) |  | 25.40% | 15.30% | 4.80%
Effective income tax rate excluding provisional (benefit) |  |  |  | (12.90%) |  |  | 15.80% |
Favorable discrete adjustment for excess tax benefits related to equity compensation |  |  |  |  |  |  |  | $ 11.5
Unremitted foreign earnings |  |  |  |  | $ 64.1 |  |  |
Deferred income tax liability |  |  |  | $ 20.0 |  |  | $ 20.0 |
Preliminary estimate of foreign earnings, not considered to be permanently reinvested |  |  |  | $ 446.0 |  |  | $ 446.0 |

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