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Stock Repurchase Program - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | ---
Feb. 17, 2017 | Jan. 31, 2017 | Jan. 31, 2016 | Feb. 17, 2017 | Aug. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  | $ 500,000,000 |  |  | $ 500,000,000
Remaining amount available for further repurchases |  | $ 335,500,000 |  |  |
Shares repurchased (in shares) |  | 1,393,000 | 3,849,000 |  |
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 |  |  |
Subsequent Event [Member] | Accelerated Share Repurchase Program December 2016 [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 |  |  |  | $ 60.53 |
Shares repurchased (in shares) | 258,710 |  |  | 1,700,000 |

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