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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Thousands
Aug. 31, 2019
May 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items $ 258,302 $ 258,189
Accumulated amortization (116,647) (112,802)
Net carrying value, finite intangible items 141,655 145,387
Product technologies    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items 182,968 182,971
Accumulated amortization (77,967) (75,412)
Net carrying value, finite intangible items 105,001 107,559
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items 60,147 60,166
Accumulated amortization (26,995) (25,950)
Net carrying value, finite intangible items 33,152 34,216
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items 9,300 9,300
Accumulated amortization (6,470) (6,404)
Net carrying value, finite intangible items 2,830 2,896
Licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items 5,887 5,752
Accumulated amortization (5,215) (5,036)
Net carrying value, finite intangible items $ 672 $ 716