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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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