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Supporting Financial Information - Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Document Fiscal Year Focus									2016
Interest income (expense), net									$ (454)	$ (80)
Amortization of deferred financing costs									(289)	0
Other income (expense), net									(80)	824
Acquisition expense									795	0
Other income (expense), net	$ (542)	$ (374)	$ (127)	$ (575)	$ 1,466	$ (34)	$ (651)	$ (36)	$ (1,618)	744
Reduction of accrued payroll taxes related to legacy payroll tax issue					$ 1,500					$ (1,477)
Accrued interest and penalties							$ 600

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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