Income Taxes (Details 2) (USD $)	12 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Oct. 03, 2010
Deferred Tax Asset:
State taxes	$ 975,000	$ 765,000
Reserves and contingent liabilities	4,689,000	5,271,000
Allowance for doubtful accounts	2,039,000	5,876,000
Accrued liabilities	13,298,000	16,974,000
Stock-based compensation	10,980,000	10,057,000
Loss carry-forwards	2,926,000	388,000
Valuation allowance on loss carry-forwards	(2,512,000)
Total deferred tax asset	32,395,000	39,331,000
Deferred Tax Liability:
Unbilled revenue	(45,417,000)	(47,858,000)
Prepaid expense	(2,251,000)	(3,950,000)
Intangibles	(21,695,000)	(26,128,000)
Cash-to-accrual adjustments		(262,000)
Property and equipment	(8,109,000)	(9,397,000)
Total deferred tax liability	(77,472,000)	(87,595,000)
Net deferred tax liability	(45,077,000)	(48,264,000)
Undistributed earnings of foreign subsidiaries	37,000,000
Unrecognized tax benefits that would affect the effective tax rate, if recognized	18,500,000
Period during which unrecognized tax benefits would affect the effective tax rate	P12M
A reconciliation of the beginning and ending amount of unrecognized tax benefits
Beginning balance	25,940,000	21,806,000	20,530,000
Additions for current year tax positions	6,273,000	8,007,000	6,895,000
Additions for prior year tax positions	19,000	2,554,000	2,720,000
Reductions for prior year tax positions	(8,072,000)	(6,315,000)	(5,093,000)
Settlements	(68,000)	(112,000)	(3,246,000)
Ending balance	24,092,000	25,940,000	21,806,000
Amount of interest expense (net of interest income) accrued	$ 3,100,000	$ 3,200,000