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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Aug. 31, 2018
Feb. 28, 2018
Feb. 28, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning Balance     $ 2,294,346,000 $ 2,368,344,000  
Other comprehensive income (loss) before reclassifications       47,072,000  
Amounts reclassified from AOCI       (15,084,000)  
Total other comprehensive income $ 35,124,000 $ 44,236,000   31,988,000 $ 31,198,000
Ending Balance 2,294,346,000     2,294,346,000  
Net tax benefit (expense) of foreign currency translation adjustment component of accumulated other comprehensive income 0     0  
Net tax benefit (expense) of available for sale securities component of accumulated other comprehensive income 0     0  
Foreign Currency Translation Adjustment          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning Balance     78,503,000 57,582,000  
Other comprehensive income (loss) before reclassifications       20,921,000  
Amounts reclassified from AOCI       0  
Total other comprehensive income       20,921,000  
Ending Balance 78,503,000     78,503,000  
Derivative Instruments          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning Balance     43,279,000 29,967,000  
Other comprehensive income (loss) before reclassifications       28,396,000  
Amounts reclassified from AOCI       (15,084,000)  
Total other comprehensive income       13,312,000  
Ending Balance 43,279,000     43,279,000  
Actuarial (Loss) Gain          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning Balance     (33,646,000) (33,215,000)  
Other comprehensive income (loss) before reclassifications       (431,000)  
Amounts reclassified from AOCI       0  
Total other comprehensive income       (431,000)  
Ending Balance (33,646,000)     (33,646,000)  
Prior Service Cost          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning Balance     889,000 889,000  
Other comprehensive income (loss) before reclassifications       0  
Amounts reclassified from AOCI       0  
Total other comprehensive income       0  
Ending Balance 889,000     889,000  
Available for Sale Securities          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning Balance     (2,417,000) (603,000)  
Other comprehensive income (loss) before reclassifications       (1,814,000)  
Amounts reclassified from AOCI       0  
Total other comprehensive income       (1,814,000)  
Ending Balance (2,417,000)     (2,417,000)  
AOCI Attributable to Parent          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning Balance     86,608,000 54,620,000  
Ending Balance $ 86,608,000     86,608,000  
Income Tax Expense | Derivative Instruments          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from AOCI       $ (7,000,000)  
Scenario, Forecast | Income Tax Expense | Derivative Instruments          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from AOCI     $ (7,800,000)