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Accounting Policies - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Dec. 29, 2017 | Dec. 22, 2017 | May 31, 2018 USD ($) | Nov. 30, 2018
Significant Accounting Policies [Line Items] |  |  |  |
Stock split ratio | 1.33 |  |  |
Federal corporate tax rate |  | 35.00% |  | 21.00%
Deferred tax benefit |  |  | $ 6.0 |
Deferred tax benefit, net |  |  | 4.8 |
Current tax expense |  |  | $ 1.2 |
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Marketable securities, maturity period |  |  |  | 91 days
Finite lived intangible assets, useful life |  |  |  | 5 years
Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Marketable securities, maturity period |  |  |  | 1 year
Finite lived intangible assets, useful life |  |  |  | 25 years

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