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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 33,756	$ 34,401	$ 67,508	$ 64,616
Prime
Disaggregation of Revenue [Line Items]
Total Revenue	33,538		67,066
Subcontractor
Disaggregation of Revenue [Line Items]
Total Revenue	218		442
Time and materials
Disaggregation of Revenue [Line Items]
Total Revenue	32,625		65,415
Cost plus fixed fee
Disaggregation of Revenue [Line Items]
Total Revenue	637		1,246
Firm fixed price
Disaggregation of Revenue [Line Items]
Total Revenue	494		847
Department of Veterans Affairs
Disaggregation of Revenue [Line Items]
Total Revenue	23,197		46,008
Department of Health and Human Services
Disaggregation of Revenue [Line Items]
Total Revenue	9,706		19,973
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 853		$ 1,527

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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