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Financial Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 29, 2016
Aug. 31, 2015
Financial Instruments [Line Items]    
Amortized cost $ 846,183 $ 992,839
Unrealized gains 128 94
Unrealized losses (480) (368)
Fair value 845,831 992,565
Cash and cash equivalents 579,526 702,074
Current marketable securities 215,038 194,676
Noncurrent marketable securities $ 51,267 95,815
Maximum [Member]    
Financial Instruments [Line Items]    
Marketable securities maturities 3 years  
Cash [Member]    
Financial Instruments [Line Items]    
Amortized cost $ 426,916 564,225
Unrealized gains 0 0
Unrealized losses 0 0
Fair value 426,916 564,225
Cash and cash equivalents 426,916 564,225
Current marketable securities 0 0
Noncurrent marketable securities 0 0
Money market funds [Member]    
Financial Instruments [Line Items]    
Amortized cost 124,061 107,408
Unrealized gains 0 0
Unrealized losses 0 0
Cash and cash equivalents 124,061 107,408
Current marketable securities 0 0
Noncurrent marketable securities 0 0
Corporate bonds [Member]    
Financial Instruments [Line Items]    
Amortized cost 120,895 137,283
Unrealized gains 10 16
Unrealized losses (449) (271)
Cash and cash equivalents 0 1,823
Current marketable securities 96,787 82,047
Noncurrent marketable securities 23,669 53,158
Tax-exempt municipal bonds [Member]    
Financial Instruments [Line Items]    
Amortized cost 89,047 97,022
Unrealized gains 113 68
Unrealized losses (15) (60)
Cash and cash equivalents 2,395 2,408
Current marketable securities 64,162 61,530
Noncurrent marketable securities 22,588 33,092
Time deposits [Member]    
Financial Instruments [Line Items]    
Amortized cost 50,392 50,267
Unrealized gains 0 0
Unrealized losses 0 0
Cash and cash equivalents 25,154 25,110
Current marketable securities 25,238 25,157
Noncurrent marketable securities 0 0
Other [Member]    
Financial Instruments [Line Items]    
Amortized cost 34,872 36,634
Unrealized gains 5 10
Unrealized losses (16) (37)
Cash and cash equivalents 1,000 1,100
Current marketable securities 28,851 25,942
Noncurrent marketable securities 5,010 9,565
Level 1 [Member] | Money market funds [Member]    
Financial Instruments [Line Items]    
Fair value 124,061 107,408
Level 2 [Member] | Corporate bonds [Member]    
Financial Instruments [Line Items]    
Fair value 120,456 137,028
Level 2 [Member] | Tax-exempt municipal bonds [Member]    
Financial Instruments [Line Items]    
Fair value 89,145 97,030
Level 2 [Member] | Time deposits [Member]    
Financial Instruments [Line Items]    
Fair value 50,392 50,267
Level 2 [Member] | Other [Member]    
Financial Instruments [Line Items]    
Fair value $ 34,861 $ 36,607