Assets Held-for-sale and Discontinued Operations (Details) € in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 27, 2018 EUR (€)	Sep. 30, 2017 USD ($)
Current liabilities:
Total current liabilities held-for-sale	$ 16,516		$ 16,516			$ 9,727
Total noncurrent liabilities held-for-sale	0		0			5,222
Modcom GmbH | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Original purchase price | €					€ 10,000
Currents assets:
Cash and cash equivalents	2,535		2,535			3,464
Accounts receivable, net	7,936		7,936			9,957
Unbilled accounts receivable	553		553			69
Inventories, net	446		446			404
Deferred costs	2,978		2,978			910
Deferred income taxes	854		854			0
Other current assets	373		373			63
Property, equipment and improvements, net	588		588			0
Total current assets held-for-sale	16,263		16,263			14,867
Property, equipment and improvements, net	0		0			589
Deferred costs	0		0			609
Deferred income taxes	0		0			864
Other noncurrent assets, net	0		0			126
Total noncurrent assets held-for-sale	0		0			2,188
Current liabilities:
Accounts payable and accrued expenses	4,667		4,667			3,950
Deferred revenue	6,409		6,409			5,264
Pension and retirement plans	5,319		5,319			209
Other current liabilities	121		121			304
Total current liabilities held-for-sale	16,516		16,516			9,727
Pension and retirement plans	0		0			5,165
Other noncurrent liabilities	0		0			57
Total noncurrent liabilities held-for-sale	0		0			$ 5,222
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Sales	5,681	$ 4,103	16,428	$ 15,630
Cost of sales	5,150	3,452	14,180	13,043
Gross profit	531	651	2,248	2,587
Selling, general and administrative expenses	922	933	2,656	2,711
Operating loss	(391)	(282)	(408)	(124)
Other expenses	(36)	(10)	(95)	(23)
Loss before income taxes	(427)	(292)	(503)	(147)
Income tax expense (benefit)	1	(55)	0	(6)
Loss from discontinued operations, net of tax	$ (428)	$ (237)	$ (503)	$ (141)