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Stock-Based Compensation Expense Included in Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 19,789 $ 31,154 $ 25,440
Stock-based compensation expense, included in restructuring expense 116 4,283 2,136
Total stock-based compensation cost 19,905 35,437 27,576
Income tax (benefit) (2,784) (6,937) (7,178)
Total stock-based compensation cost, net of tax 17,121 28,500 20,398
SG&A      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 19,789 $ 31,154 $ 25,440