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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 09, 2015 | Dec. 15, 2015 | Aug. 31, 2015 | Dec. 31, 2014 | Jul. 31, 2015 | Apr. 30, 2016 | Jan. 31, 2016 | Jul. 31, 2015 | Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2013 | Sep. 01, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  |  |  |  |  |  |  |  | $ 45.84 | $ 38.72 | $ 36.29 |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  | $ 260,000 | $ 119,747 | $ 145,016 |
Stock repurchase program authorized amount |  |  |  |  |  |  |  |  | 500,000 |  |  | $ 500,000
Remaining amount available for further repurchases |  |  |  |  |  |  |  |  | 500,000 |  |  |
Settlement of equity forward contract |  |  |  |  |  |  |  |  | $ 20,000 | $ 0 | $ 0 |
Accelerated Share Repurchase Program December 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  |  |  |  |  |  |  | $ 45.37 |  |  |  |
Stock Repurchase Program, Prepayment During Period |  |  |  | $ 180,000 |  |  |  |  |  |  |  |
Accelerated Share Repurchase, Initial Share Delivery, Amount |  |  |  | 144,000 |  |  |  |  |  |  |  |
Stock Repurchase Program, Prepayment During Period, Derivative Settlement |  |  |  |  | $ 36,000 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  | $ 4,000 |  |  |  |
Stock repurchase program authorized amount |  |  |  | $ 180,000 |  |  |  |  |  |  |  |
Accelerated Share Repurchase Program August 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  |  | $ 46.94 |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Prepayment During Period |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase, Initial Share Delivery, Amount |  |  | 80,000 |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Accelerated Share Repurchase Program August 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  | $ 48.06 |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 2,100 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Accelerated Share Repurchase Program December 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Prepayment During Period | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase, Initial Share Delivery, Amount | 160,000 |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase amount | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Average Price Paid Per Share | $ 46.08 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] | Accelerated Share Repurchase Program August 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining repurchase amount |  |  |  |  |  |  | $ 20,000 |  |  |  |  |
Scenario, Forecast [Member] | Subsequent Event [Member] | Accelerated Share Repurchase Program December 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining repurchase amount |  |  |  |  |  | $ 40,000 |  |  |  |  |  |

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