Income Taxes - Unrecognized Tax Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Abstract]
Unrecognized Tax Benefits Beginning Balance	$ 55,963	$ 56,079
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	0	98
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0	1
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	27	198
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	69	0
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	0	17
Unrecognized Tax Benefits Ending Balance	$ 55,867	$ 55,963

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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