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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
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Dec. 22, 2017 | May 31, 2018
Income Taxes [Line Items] |  |
Decreased income tax expense |  | $ (4,800)
Federal corporate tax rate | 35.00% | 21.00%
Deferred tax benefit |  | $ (6,022)
Current tax expense |  | $ 1,223

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