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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 09, 2016 | Aug. 31, 2016 | May 31, 2016 | Apr. 30, 2016 | Dec. 31, 2015 | Aug. 31, 2015 | Feb. 16, 2017 | Jan. 31, 2016 | Aug. 31, 2016 | May 31, 2016 | Jan. 31, 2016 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 49.37 | $ 45.84 | $ 38.72
Purchases of treasury stock, shares |  |  |  |  |  |  |  |  |  |  |  | 8,506 | 5,672 | 3,092
Stock repurchase program authorized amount |  | $ 500.0 |  |  |  |  |  |  | $ 500.0 |  |  | $ 500.0 |  |
Remaining amount available for further repurchases |  |  |  |  |  |  |  |  |  |  |  | $ 436.0 |  |
Accelerated Share Repurchase Program August 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  |  |  |  |  |  |  |  |  |  | $ 48.06 |  |  |
Stock repurchase program, prepayment during period |  |  |  |  |  | $ 100.0 |  |  |  |  |  |  |  |
Accelerated share repurchase, initial share delivery, amount |  |  |  |  |  | 80.0 |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement |  |  |  |  |  |  |  | $ 20.0 |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  |  |  |  |  |  |  |  | 2,100 |  |  |
Stock repurchase program authorized amount |  |  |  |  |  | $ 100.0 |  |  |  |  |  |  |  |
Accelerated Share Repurchase Program December 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  |  |  |  |  |  |  |  |  | $ 44.40 |  |  |  |
Stock repurchase program, prepayment during period |  |  |  |  | $ 200.0 |  |  |  |  |  |  |  |  |
Accelerated share repurchase, initial share delivery, amount |  |  |  |  | 160.0 |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement |  |  | $ 20.0 | $ 20.0 |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  |  |  |  |  |  |  | 4,500 |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 200.0 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase Program May 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average purchase price |  |  |  |  |  |  |  |  | $ 52.98 |  |  |  |  |
Stock repurchase program, prepayment during period |  |  | 125.0 |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, initial share delivery, amount |  |  | 100.0 |  |  |  |  |  |  | $ 100.0 |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement |  | $ 25.0 |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  |  |  |  |  |  | 2,400 |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 125.0 |  |  |  |  |  |  | $ 125.0 |  |  |  |
Subsequent Event [Member] | Accelerated Share Repurchase Program December 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during period | $ 100.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, initial share delivery, amount | 80.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ 100.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] | Accelerated Share Repurchase Program December 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement |  |  |  |  |  |  | $ 20.0 |  |  |  |  |  |  |

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