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Summary of Significant Accounting Policies - Summary of Impact of Adoption of ASC 606 on Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
Account receivable-unbilled $ 227,061 $ 274,036 $ 263,997
Prepaid expenses and other current assets 216,084   229,999
Other noncurrent assets 423,941   420,369
Deferred revenue (current) 118,182 146,462 132,414
Accrued expenses and other current liabilities 647,657   706,637
Deferred income taxes and taxes payable 207,508   224,572
Retained earnings $ 5,012,799   $ 4,673,901
Accounting Standards Update 2014-09 [Member]      
Account receivable-unbilled   274,036  
Prepaid expenses and other current assets   229,028  
Other noncurrent assets   436,005  
Deferred revenue (current)   146,462  
Accrued expenses and other current liabilities   692,575  
Deferred income taxes and taxes payable   234,996  
Retained earnings   4,688,195  
Accounting Standards Update 2014-09 [Member] | Adjustments due to ASC 606 [Member]      
Account receivable-unbilled   10,039  
Prepaid expenses and other current assets   (971)  
Other noncurrent assets   15,636  
Deferred revenue (current)   14,048  
Accrued expenses and other current liabilities   (14,062)  
Deferred income taxes and taxes payable   10,424  
Retained earnings   $ 14,294