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Summary of Significant Accounting Policies - Amounts Reclassified out of Accumulated Other Comprehensive Loss (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Interest and foreign exchange $ 8,786 $ 6,533 $ 7,029 $ 7,020 $ 8,901 $ 7,894 $ 5,673 $ 1,724 $ 29,368 $ 24,192 $ 13,502
Total before tax (50,348) (65,006) (53,841) (54,422) (48,879) (40,578) (75,847) (70,936) (223,617) (236,240) (395,050)
Tax benefit $ 10,115 $ 15,944 $ (11,301) $ 18,135 $ 10,114 $ 8,656 $ 24,858 $ 20,386 32,893 64,014 $ 112,322
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Total before tax                 (418) 4,701  
Tax benefit                 3 (972)  
Net of tax                 (415) 3,729  
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss | Foreign Exchange Contracts                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Revenue and Cost of revenue                 (716) 3,644  
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss | Interest rate swap contracts                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Interest and foreign exchange                 $ 298 $ 1,057