Income Taxes (Details 2) (USD $)	12 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Sep. 27, 2009
Deferred Tax Asset:
State taxes	$ 765,000	$ 977,000
Reserves and contingent liabilities	5,271,000	6,984,000
Allowance for doubtful accounts	5,876,000	8,085,000
Accrued liabilities	16,974,000	16,217,000
Stock-based compensation	10,057,000	7,903,000
Loss carry-forward	388,000	5,569,000
Valuation allowance on capital loss carry-forward		(5,526,000)
Total deferred tax asset	39,331,000	40,209,000
Decrease in capital loss carryforward valuation allowance	5,500,000	5,800,000	0
Deferred Tax Liability:
Unbilled revenue	(47,858,000)	(43,250,000)
Prepaid expense	(3,950,000)	(2,020,000)
Intangibles	(26,128,000)	(16,327,000)
Cash-to-accrual adjustments	(262,000)	(717,000)
Property and equipment	(9,397,000)	(12,252,000)
Total deferred tax liability	(87,595,000)	(74,566,000)
Net deferred tax liability	(48,264,000)	(34,357,000)
Undistributed earnings of foreign subsidiaries	12,200,000
Unrecognized tax benefits that would affect the effective tax rate, if recognized	19,200,000
A reconciliation of the beginning and ending amount of unrecognized tax benefits
Beginning balance	21,806,000	20,530,000	38,912,000
Additions for current year tax positions	8,007,000	6,895,000	7,306,000
Additions for prior year tax positions	2,554,000	2,720,000	9,208,000
Reductions for prior year tax positions	(6,315,000)	(5,093,000)	(24,955,000)
Settlements	(112,000)	(3,246,000)	(9,941,000)
Ending balance	25,940,000	21,806,000	20,530,000
Amount of interest expense (net of interest income) accrued	$ 3,200,000	$ 4,000,000