The price per share of the conversion feature embedded in the debt instrument.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Conversion Rate
-URI http://asc.fasb.org/extlink&oid=6509012

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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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
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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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.

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No definition available.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

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Convertible Senior Notes, Warrants and Hedges (Offering) (Details) - Convertible debt			9 Months Ended
	Nov. 04, 2015 $ / shares	Nov. 03, 2015 USD ($)	Jan. 01, 2017 USD ($)	Oct. 29, 2015 USD ($)
Debt Instrument [Line Items]
Conversion ratio on convertible debt (percent)	0.029892
0.875% Convertible Senior Notes Due 2022
Debt Instrument [Line Items]
Principal amount of debt		$ 48,800,000.0	$ 373,800,000.0	$ 325,000,000
Interest rate (percent)			0.875%	0.875%
Proceeds from private offering		$ 363,445,000	$ 363,400,000
Stock price trigger to convert convertible debt (in dollars per share) \| $ / shares	$ 33.45