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Stock Repurchase Program - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 19, 2017 | Feb. 17, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Apr. 30, 2016 | May 19, 2017 | Feb. 17, 2017 | Apr. 30, 2017 | Apr. 30, 2016 | Aug. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 500,000,000 |  |  |  |  | $ 500,000,000 |  | $ 500,000,000
Remaining amount available for further repurchases |  |  | $ 235,500,000 |  |  |  |  | $ 235,500,000 |  |
Shares repurchased (in shares) |  |  | 1,381,000 |  | 515,000 |  |  | 2,775,000 | 4,364,000 |
Accelerated Share Repurchase Program December 2016 [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 |  |  |  |  |  |  | $ 60.53 |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | 1,700,000 |  |  |
Accelerated Share Repurchase Program February 2017 [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 100,000,000 |  |  |  |  | $ 100,000,000 |  |
Prepayment amount |  |  | 100,000,000 |  |  |  |  |  |  |
Accelerated share repurchase, initial share delivery, amount |  |  | $ 80,000,000 |  |  |  |  | $ 80,000,000 |  |
Subsequent Event | Accelerated Share Repurchase Program February 2017 [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 |  |  |  |  |  | $ 72.02 |  |  |  |
Shares repurchased (in shares) | 265,894 |  |  |  |  | 1,400,000 |  |  |  |

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