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Income Taxes - Schedule of temporary differences comprising the net deferred income tax liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Deferred Tax Assets:    
State taxes $ 598 $ 697
Reserves and contingent liabilities 2,941 2,539
Allowance for doubtful accounts 4,273 3,817
Accrued liabilities 22,466 24,663
Stock-based compensation 10,069 10,684
Intangibles 0 0
Loss carry-forwards 28,261 23,514
Valuation allowance (25,326) (25,447)
Total deferred tax assets 43,282 40,467
Deferred Tax Liabilities:    
Unbilled revenue (46,408) (54,638)
Prepaid expense (6,253) (2,921)
Intangibles (24,328) (33,268)
Property and equipment (8,311) (9,358)
Total deferred tax liability (85,300) (100,185)
Net deferred tax liabilities (42,018) $ (59,718)
Undistributed earnings of foreign subsidiaries 68,400  
Incremental federal tax due to repatriation of foreign earnings 6,200  
Unrecognized tax benefits that would affect the effective tax rate, if recognized $ 9,300  
Period during which unrecognized tax benefits would affect the effective tax rate 12 months  
State | Expiration dates through 2036    
Deferred Tax Liabilities:    
Net operating loss carry forwards which expire at various dates $ 43,700  
Foreign    
Deferred Tax Liabilities:    
Net operating loss carry forwards which have no expiration date 64,000  
Foreign | Expiration dates through 2036    
Deferred Tax Liabilities:    
Net operating loss carry forwards which expire at various dates 28,800  
Net operating loss carryforwards $ 92,900