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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 09, 2015 | Aug. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Apr. 30, 2016 | Jan. 31, 2016 | Sep. 01, 2015
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 |  |  | $ 300,000,000 |  |  | $ 300,000,000 |
Shares repurchased (in shares) |  |  | 3,849 | 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 |  |  |  |  |  |
Average purchase price of shares purchased under agreement | $ 46.08 |  |  |  |  |  |
Scenario, Forecast [Member] | Accelerated Share Repurchase Program December 2015 [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Accelerated Share Repurchases, Remaining Agreement Amount |  |  |  |  | $ 40,000,000 |  |

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