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.

No definition available.

+ 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

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Details

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- Details

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Summary of Significant Accounting Policies - Convertible Debt Securities (Details)	12 Months Ended
	Sep. 30, 2017	Jul. 31, 2017	Jun. 30, 2014
Convertible Senior Notes
Debt Conversion [Line Items]
Stated interest rate	2.125%	2.875%	2.125%
2.875% Convertible Senior Notes, Due 2024
Debt Conversion [Line Items]
Stated interest rate	2.875%	2.875%
Liability Component of Convertible Debt \| 2.875% Convertible Senior Notes, Due 2024
Debt Conversion [Line Items]
Fair value assumptions, discount rate	8.00%