Income Taxes - Schedule of temporary differences comprising the net deferred income tax liability (Details) - USD ($) $ in Thousands	Sep. 29, 2019	Sep. 30, 2018
Deferred Tax Assets:
State taxes	$ 764	$ 1,220
Reserves and contingent liabilities	5,500	2,646
Allowance for doubtful accounts	7,506	4,259
Accrued liabilities	28,232	19,611
Stock-based compensation	6,700	6,338
Loss carry-forwards	39,782	23,492
Valuation allowance	(20,543)	(21,479)
Total deferred tax assets	67,941	36,087
Deferred Tax Liabilities:
Unbilled revenue	(21,886)	(25,819)
Prepaid expense	(3,026)	(3,524)
Intangibles	(26,482)	(23,319)
Property and equipment	(1,133)	(4,984)
Total deferred tax liability	(52,527)	(57,646)
Deferred tax assets, net	$ 15,414
Net deferred tax liabilities		$ (21,559)