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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Mar. 28, 2018 | Mar. 14, 2018 | Feb. 09, 2018 | Nov. 14, 2017
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  | $ 227,500 |  |  |  |
Shares repurchased, number of shares received initially (in shares) | 10,718,319 | 10,886,546 |  |  |  |
Fair value of common stock repurchased | $ 386,322 | $ 397,572 |  |  |  |
Common Stock, Shares, Outstanding | 276,210,910 | 279,222,277 |  |  |  |
Common Stock, Shares Authorized | 560,000,000 | 560,000,000 |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.10 | $ 0.10 | $ 0.10 |  |  |
Third Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  |  |  | $ 75,000
Shares repurchased, number of shares received initially (in shares) |  |  |  |  | 168,227 | 1,290,486
Fair value of common stock repurchased |  |  |  |  | $ 11,200 | $ 63,800
Treasury Stock, Shares, Acquired | 1,458,713 |  |  |  |  |
Repurchase Agreements [Member] |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  | $ 100,000 |  |  |  |
2 for 1 Stock Split [Member] |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  | 276,000,000 | 138,000,000 |  |
Common Stock, Shares Authorized |  |  | 560,000,000 | 280,000,000 |  |

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