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Open Market Share Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		8 Months Ended
	Oct. 11, 2017	Oct. 11, 2018	Sep. 09, 2018	Sep. 10, 2017	Sep. 09, 2018	Sep. 10, 2017
Share Repurchases [Line Items]
Common stock repurchased and retired (in shares)			397,490		1,751,054	4,639,223
Payments for purchases of common stock			$ 109,100		$ 429,190	$ 1,012,721
Common stock repurchased and retired during period, average price			$ 274.53		$ 245.10
Stock repurchase remaining authorized repurchase amount			$ 320,800		$ 320,800
Accelerated share repurchase, agreement amount				$ 1,000,000		$ 1,000,000
Accelerated Share Repurchase Agreement [Member]
Share Repurchases [Line Items]
Common stock repurchased and retired (in shares)	5,218,670			4,558,863
Common stock repurchased and retired during period, average price	$ 191.62
Counterparty [Member]
Share Repurchases [Line Items]
Accelerated share repurchase, share amount				4,558,863		4,558,863
2017 Recapitalization [Member]
Share Repurchases [Line Items]
Payments for purchases of common stock				$ 1,000,000
Subsequent Event [Member]
Share Repurchases [Line Items]
Common stock repurchased and retired (in shares)		36,671
Payments for purchases of common stock		$ 10,000
Common stock repurchased and retired during period, average price		$ 273.01

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