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Stock Repurchase Program - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2019 | Feb. 28, 2019 | Apr. 30, 2019 | Apr. 30, 2018 | Jan. 31, 2018 | May 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 05, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 500,000,000.0 |  |  |  | $ 500,000,000.0 |  | $ 500,000,000.0
Remaining amount available for further repurchases |  |  | $ 195,800,000 |  |  |  | $ 195,800,000 |  |
Purchases of treasury stock (in shares) |  |  | 780,000 | 916,000 |  |  | 1,126,000 | 2,902,000 |
accelerated Share repurchase program February 2019 ASR |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  | $ 100,000,000.0 |  |  |  |  |  |  |
Prepayment to repurchase stock |  | 100,000,000.0 |  |  |  |  |  |  |
Initial share delivery |  | $ 80,000,000.0 |  |  |  |  |  |  |
Accelerated Share Repurchase Program September 2017 |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, derivative settlement |  |  |  |  | $ 20,000,000.0 |  |  |  |
Open Market Share Repurchase |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  | 400,000 |  |  |  |  |
Shares repurchased average price per share (in USD per share) |  |  |  | $ 82.61 |  |  |  |  |
Shares repurchased during period |  |  |  | $ 35,000,000.0 |  |  |  |  |
Subsequent Event | accelerated Share repurchase program February 2019 ASR |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, derivative settlement | $ 20,000,000.0 |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) | 97,601 |  |  |  |  | 900,000 |  |  |
Shares repurchased average price per share (in USD per share) |  |  |  |  |  | $ 114.01 |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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