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Financial Instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
May 31, 2016
Aug. 31, 2015
Financial Instruments [Line Items]    
Amortized cost $ 828,599 $ 992,839
Unrealized gains 75 94
Unrealized losses (204) (368)
Fair value 828,470 992,565
Cash and cash equivalents 546,846 702,074
Current marketable securities 242,301 194,676
Noncurrent marketable securities $ 39,323 95,815
Maximum [Member]    
Financial Instruments [Line Items]    
Marketable securities maturities 3 years  
Cash [Member]    
Financial Instruments [Line Items]    
Amortized cost $ 408,823 564,225
Unrealized gains 0 0
Unrealized losses 0 0
Fair value 408,823 564,225
Cash and cash equivalents 408,823 564,225
Current marketable securities 0 0
Noncurrent marketable securities 0 0
Money market funds [Member]    
Financial Instruments [Line Items]    
Amortized cost 111,236 107,408
Unrealized gains 0 0
Unrealized losses 0 0
Cash and cash equivalents 111,236 107,408
Current marketable securities 0 0
Noncurrent marketable securities 0 0
Corporate bonds [Member]    
Financial Instruments [Line Items]    
Amortized cost 113,004 137,283
Unrealized gains 30 16
Unrealized losses (155) (271)
Cash and cash equivalents 0 1,823
Current marketable securities 96,531 82,047
Noncurrent marketable securities 16,348 53,158
Tax-exempt municipal bonds [Member]    
Financial Instruments [Line Items]    
Amortized cost 104,281 97,022
Unrealized gains 33 68
Unrealized losses (43) (60)
Cash and cash equivalents 600 2,408
Current marketable securities 84,324 61,530
Noncurrent marketable securities 19,347 33,092
Time deposits [Member]    
Financial Instruments [Line Items]    
Amortized cost 50,458 50,267
Unrealized gains 0 0
Unrealized losses 0 0
Cash and cash equivalents 25,187 25,110
Current marketable securities 25,271 25,157
Noncurrent marketable securities 0 0
Other [Member]    
Financial Instruments [Line Items]    
Amortized cost 40,797 36,634
Unrealized gains 12 10
Unrealized losses (6) (37)
Cash and cash equivalents 1,000 1,100
Current marketable securities 36,175 25,942
Noncurrent marketable securities 3,628 9,565
Level 1 [Member] | Money market funds [Member]    
Financial Instruments [Line Items]    
Fair value 111,236 107,408
Level 2 [Member] | Corporate bonds [Member]    
Financial Instruments [Line Items]    
Fair value 112,879 137,028
Level 2 [Member] | Tax-exempt municipal bonds [Member]    
Financial Instruments [Line Items]    
Fair value 104,271 97,030
Level 2 [Member] | Time deposits [Member]    
Financial Instruments [Line Items]    
Fair value 50,458 50,267
Level 2 [Member] | Other [Member]    
Financial Instruments [Line Items]    
Fair value $ 40,803 $ 36,607