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Stock Repurchase Program - Additional Information (Detail) $ / shares in Units, shares in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended |
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Mar. 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Dec. 31, 2017 USD ($) share_repurchase_program | Nov. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Apr. 30, 2018 USD ($) $ / shares shares | Jan. 31, 2018 USD ($) | Nov. 30, 2017 $ / shares shares | Apr. 30, 2017 shares | Mar. 31, 2018 $ / shares shares | Apr. 30, 2018 USD ($) shares | Apr. 30, 2017 shares | Apr. 05, 2018 USD ($)
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 |  |  |  |  |  | $ 490,000,000 |  |  |  |  | $ 490,000,000 |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 916 |  |  | 1,381 |  | 2,902 | 2,775 |
Accelerated Share Repurchase Program September 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |
Prepayment amount |  |  |  |  | 100,000,000.0 |  |  |  |  |  |  |  |
Accelerated share repurchase, initial share delivery, amount |  |  |  |  | $ 80,000,000.0 |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, derivative settlement |  |  |  | $ 20,000,000.0 |  |  | $ 20,000,000.0 |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  |  | 1,200 |  |  |  |  |
Average purchase price of shares purchased under agreement (in USD per share) | $ / shares |  |  |  |  |  |  |  | $ 83.80 |  |  |  |  |
Accelerated Share Repurchase Program December 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |  |  |
Prepayment amount |  |  | 200,000,000.0 |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, initial share delivery, amount |  |  | $ 160,000,000.0 |  |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, derivative settlement | $ 20,000,000.0 | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  | 2,300 |  |  |
Average purchase price of shares purchased under agreement (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 87.08 |  |  |
Accelerated share repurchase programs entered into | share_repurchase_program |  |  | 2 |  |  |  |  |  |  |  |  |  |
Open Market Share Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 400 |  |  |  |  |  |  |
Average purchase price of shares purchased under agreement (in USD per share) | $ / shares |  |  |  |  |  | $ 82.61 |  |  |  |  |  |  |
Stock repurchased during period, value |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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