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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

X

- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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X

- 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

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X

- 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

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Namespace Prefix:	us-gaap_
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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X

- Definition

Debt Instrument, Convertible, If-converted Value Less Than of Principal

+ References

No definition available.

+ Details

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- Details

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