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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 73,069	$ 76,620
Other comprehensive income (loss) before reclassifications	(1,913)	(1,721)
Amounts reclassified from accumulated other comprehensive loss	1,051	346
Net current-period other comprehensive loss	(862)	(1,375)
Ending Balance	60,370	73,069
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, tax benefit	0	0
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5,731)	(5,851)
Other comprehensive income (loss) before reclassifications	108	120
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive loss	108	120
Ending Balance	(5,623)	(5,731)
Retirement Plan Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, tax benefit	3,758	3,758
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(6,257)	(4,757)
Other comprehensive income (loss) before reclassifications	(1,991)	(1,846)
Amounts reclassified from accumulated other comprehensive loss	1,051	346
Net current-period other comprehensive loss	(940)	(1,500)
Ending Balance	(7,197)	(6,257)
Interest Rates Swap Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, tax benefit	0	0
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0	(5)
Other comprehensive income (loss) before reclassifications	(30)	5
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive loss	(30)	5
Ending Balance	(30)	0
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(11,988)	(10,613)
Ending Balance	$ (12,850)	$ (11,988)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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