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Fair Value Measurements - Narrative (Detail) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Jan. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Closing price of company's common stock, dollars per share | $ 124.84 |  |  |
0.75% Convertible senior notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Convertible senior notes, principal amount | $ 350,000,000 | $ 350,000,000 |  | $ 350,000,000
Contractual interest rate | 0.75% |  |  | 0.75%
If-converted value in excess of principal | $ 175,000,000 |  |  |
1.50% Convertible senior notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Convertible senior notes, principal amount | $ 250,000,000 | $ 250,000,000 |  | $ 250,000,000
Contractual interest rate | 1.50% |  |  | 1.50%
If-converted value in excess of principal | $ 132,000,000 |  |  |
0.25% Convertible senior notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Convertible senior notes, principal amount |  |  | $ 1,150,000,000.00 |
Contractual interest rate | 0.25% |  | 0.25% |
If-converted value less than principal | $ 174,000,000 |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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