Long-Term Debt - Schedule of Debt Instruments (Details) - USD ($)	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2014
Debt Instrument [Line Items]
Gross Amount	$ 317,692,000	$ 240,505,000
Debt Discount and Issuance Costs	(34,081,000)	(42,529,000)
Carrying Amount	$ 283,611,000	197,976,000
2.125% Cash convertible senior notes due 2019
Debt Instrument [Line Items]
Stated interest rate	2.125%		2.125%
Senior Notes \| 2.125% Cash convertible senior notes due 2019
Debt Instrument [Line Items]
Gross Amount	$ 230,000,000	230,000,000
Debt Discount and Issuance Costs	(32,046,000)	(42,529,000)
Carrying Amount	$ 197,954,000	$ 187,471,000
Stated interest rate	2.125%	2.125%
Senior Notes \| Cash convertible senior notes due 2019 embedded derivative
Debt Instrument [Line Items]
Gross Amount	$ 37,692,000	$ 10,505,000
Debt Discount and Issuance Costs	0	0
Carrying Amount	37,692,000	10,505,000
Line of Credit \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Gross Amount	50,000,000	0
Debt Discount and Issuance Costs	(2,035,000)	0
Carrying Amount	$ 47,965,000	$ 0
Stated interest rate	2.125%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

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Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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