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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 80,256	$ 74,890	$ 80,663	$ 81,156	$ 81,329	$ 76,258	$ 82,497	$ 84,179		$ 316,965	$ 324,263	$ 347,146
Income (loss) from operations
Loss from operations	(11,051)	(11,800)	(8,820)	(3,604)	(1,114)	(2,784)	687	1,387		(35,275)	(1,824)	(18,623)
Depreciation and amortization
Total Depreciation and Amortization										15,688	16,886	17,749
Net income (loss)
Net income (loss)	(11,001)	$ (11,713)	$ (8,833)	$ (1,135)	(757)	$ (3,917)	$ (1,730)	(1,724)		(32,682)	(8,128)	(47,696)
Goodwill
Goodwill	8,222				9,005					8,222	9,005	9,005
Assets
Total assets	282,278				274,102					282,278	274,102	297,159
Depreciation of training equipment obtained in exchange for services								$ 1,300	$ 1,300	1,386	1,283	1,342
Intersegment eliminations
Segment Reporting Information [Line Items]
Revenues											(894)	0
Operating Segments [Member] | Postsecondary education
Segment Reporting Information [Line Items]
Revenues										300,753	308,884	334,156
Income (loss) from operations
Loss from operations										(31,707)	(315)	(13,980)
Depreciation and amortization
Total Depreciation and Amortization										14,978	16,502	17,222
Net income (loss)
Net income (loss)										(29,713)	(8,422)	(44,467)
Goodwill
Goodwill	8,222				8,222					8,222	8,222	8,222
Assets
Total assets	275,427				266,370					275,427	266,370	289,688
Corporate, Non-Segment [Member] | Other
Segment Reporting Information [Line Items]
Revenues										16,218	16,273	12,990
Income (loss) from operations
Loss from operations										(3,568)	(1,509)	(4,643)
Depreciation and amortization
Total Depreciation and Amortization										710	384	527
Net income (loss)
Net income (loss)										(2,969)	294	(3,229)
Goodwill
Goodwill	0				783					0	783	783
Assets
Total assets	$ 6,851				$ 7,732					6,851	$ 7,732	$ 7,471
Intersegment eliminations
Segment Reporting Information [Line Items]
Revenues										$ (6)

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