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Income Per Share and Stockholders' Equity - Narrative (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020	Nov. 30, 2019	Aug. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, value		$ 64,142,000	$ 50,028,000
Capacity remaining under current stock repurchase program		285,900,000
October 2016 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase term	3 years
March 2019 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, value				$ 50,000,000.0
Class A common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase amount		500,000,000.0
Shares repurchased during the period, value		8,000
Class A common stock | October 2016 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase amount	$ 300,000,000.0
Class A common stock | March 2019 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share additional repurchase amount					$ 100,000,000.0	$ 100,000,000.0
Shares repurchased during the period, value		$ 64,100,000
Shares repurchased during the period (in shares)		831,274		1,050,084
Average price per share (in dollars per share)		$ 77.15		$ 47.62
Contingently Issuable Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded in computation of diluted income per share (in shares)		481,341	341,359

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