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Indebtedness - Issuances and Principal Repayment (Details) - USD ($) $ in Thousands					9 Months Ended
	Oct. 26, 2017	Apr. 24, 2017	Mar. 15, 2017	Jan. 13, 2017	Sep. 30, 2017	Sep. 30, 2016	Oct. 29, 2017
Indebtedness
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses					$ 598,246	$ 737,612
Repurchase of convertible senior notes					$ 8,478	$ 0
Senior unsecured notes, due 2027 at 4.95%
Indebtedness
Interest rate, stated percentage					4.95%
Senior unsecured notes, due 2018 at 6.70%
Indebtedness
Interest rate, stated percentage					6.70%
Senior unsecured notes
Indebtedness
Issuance of senior notes				$ 600,000
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses				593,228
Senior unsecured notes | Senior unsecured notes, due 2023 at 4.5%
Indebtedness
Issuance of senior notes				$ 200,000
Interest rate, stated percentage				4.50%
Senior unsecured notes | Senior unsecured notes, due 2027 at 4.95%
Indebtedness
Issuance of senior notes				$ 400,000
Interest rate, stated percentage				4.95%
Senior unsecured notes | Senior unsecured notes, due 2027 at 3.8%
Indebtedness
Interest rate, stated percentage			3.80%
Repurchase of convertible senior notes		$ 47	$ 8,431
Subsequent event | Senior unsecured notes | Senior unsecured notes, due 2028 at 3.950%
Indebtedness
Issuance of senior notes	$ 400,000
Interest rate, stated percentage	3.95%
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses	$ 388,244
Subsequent event | Senior unsecured notes | Senior unsecured notes, due 2018 at 6.70%
Indebtedness
Interest rate, stated percentage							6.70%
Repurchased face amount							$ 350,000

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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

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-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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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))
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 230
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-Section 45
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