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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 09, 2015 | May. 24, 2016 | Apr. 30, 2016 | Aug. 31, 2015 | Aug. 15, 2016 | Apr. 30, 2016 | Apr. 30, 2015 | May. 24, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Apr. 30, 2015 | Sep. 01, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 500,000,000 |  |  | $ 500,000,000 |  |  | $ 500,000,000 |  |  |  | $ 500,000,000
Remaining amount available for further repurchases |  |  | 300,000,000 |  |  | $ 300,000,000 |  |  | $ 300,000,000 |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  | 515 | 0 |  | 4,364 | [1] |  | 3,290 |
Accelerated Share Repurchase Program August 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
Prepayment amount |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase, Initial Share Delivery, Amount |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Prepayment During Prior Period, Derivative Settlement |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |
Average purchase price of shares purchased under agreement |  |  |  |  |  |  |  |  |  |  | $ 48.06 |  |
Shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  | 2,100 |  |
Accelerated Share Repurchase Program December 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Prepayment amount | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase, Initial Share Delivery, Amount | $ 160,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Prepayment During Prior Period, Derivative Settlement |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Accelerated Share Repurchase Program December 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Prepayment During Prior Period, Derivative Settlement |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Average purchase price of shares purchased under agreement |  |  |  |  |  |  |  | $ 44.40 |  |  |  |  |
Shares repurchased (in shares) |  | 517 |  |  |  |  |  | 4,500 |  |  |  |  |
Subsequent Event [Member] | Accelerated Share Repurchase Program May 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  | $ 125,000,000 |  |  |  |  |  | $ 125,000,000 |  |  |  |  |
Prepayment amount |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase, Initial Share Delivery, Amount |  | $ 100,000,000 |  |  |  |  |  | $ 100,000,000 |  |  |  |  |
Subsequent Event [Member] | Scenario, Forecast [Member] | Accelerated Share Repurchase Program May 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Remaining Agreement Amount |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |
[1] | Does not include the final 517,410 shares and $20.0 million equity forward contract, respectively, from the December 2015 ASRs settled in May 2016.

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