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Income Taxes - Components of Income Tax Expense of Continuing Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 31, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Current                      
Federal                 $ 28,357 $ 22,710 $ 66,455
State                 3,244 305 4,595
Foreign                 38,628 35,893 50,299
Current Income Tax Expense (Benefit), Total                 70,229 58,908 121,349
Deferred                      
Federal                 (33,459) 9,418 (6,199)
State                 (344) (1,467) (1,174)
Foreign                 (3,690) (2,732) (1,644)
Total Deferred Income Tax Expense (Benefit)                 (37,493) 5,219 (9,017)
Change in valuation allowance                 157 (113) (10)
Income tax expense $ 10,115 $ 15,944 $ (11,301) $ 18,135 $ 10,114 $ 8,656 $ 24,858 $ 20,386 $ 32,893 $ 64,014 $ 112,322