Income Taxes - Schedule of temporary differences comprising the net deferred income tax liability (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Oct. 01, 2017
Deferred Tax Assets:
State taxes	$ 1,220	$ 598
Reserves and contingent liabilities	2,646	2,941
Allowance for doubtful accounts	4,259	4,273
Accrued liabilities	19,611	22,466
Stock-based compensation	6,338	10,069
Loss carry-forwards	23,492	28,261
Valuation allowance	(21,479)	(25,326)
Total deferred tax assets	36,087	43,282
Deferred Tax Liabilities:
Unbilled revenue	(25,819)	(46,408)
Prepaid expense	(3,524)	(6,253)
Intangibles	(23,319)	(24,328)
Property and equipment	(4,984)	(8,311)
Total deferred tax liability	(57,646)	(85,300)
Net deferred tax liabilities	$ (21,559)	$ (42,018)