Mergers and Acquisitions (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended			3 Months Ended			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Oct. 02, 2011	Oct. 03, 2010	Sep. 30, 2012 Technical support services (TSS)	Sep. 30, 2012 Maximum Y	Sep. 30, 2012 Minimum Y	Oct. 03, 2010 2010 acquisitions	Jan. 02, 2011 BPR, Inc. Y	Oct. 02, 2011 BPR, Inc.	Oct. 02, 2011 2011 acquisitions	Sep. 30, 2012 Prior to 2010 acquisitions	Oct. 02, 2011 Prior to 2010 acquisitions	Oct. 03, 2010 Prior to 2010 acquisitions	Sep. 30, 2012 Prior to 2010 acquisitions Maximum	Sep. 30, 2012 2012 acquisitions
Business acquisition
Period for contingent earn-out payments (in years)						3	2		2
Aggregate purchase price								$ 107,300,000		$ 185,679,000	$ 100,300,000					$ 63,200,000
Estimated contingent earn-out payments of aggregate maximum upon achievement of specified financial objectives						68,400,000		26,700,000		39,200,000	32,300,000					20,000,000
Amount accrued as part of Other current liabilities											4,500,000					2,000,000
Initial payment								86,600,000		157,000,000	68,700,000					42,200,000
Estimated fair value of the contingent earn-out payments resulting in a discounted liability								20,700,000		28,700,000	26,900,000					19,000,000
Contingent consideration accrued as part of Estimated contingent earn-out liabilities	35,400,000	35,400,000	64,100,000
Contingent consideration accrued as part of Other long-term liabilities	16,100,000	16,100,000	11,000,000
Estimated fair values of the assets acquired and liabilities assumed
Current assets										77,698,000
Property and equipment										7,178,000
Goodwill										128,140,000
Intangible and other assets										36,988,000
Current liabilities										(42,481,000)
Long-term deferred taxes										(9,622,000)
Noncontrolling interests										(12,222,000)
Net assets acquired								107,300,000		185,679,000	100,300,000					63,200,000
Contingent consideration that will be recorded as an addition to goodwill if earned															3,000,000
Gain on fair value adjustment for contingent earn-out liabilities	17,300,000	19,246,000	1,755,000	265,000	12,500,000
Estimated Contingent Earn-out Liabilities
Beginning balance (at fair value)		75,159,000	20,504,000
Estimated earn-out liabilities for acquisition during the fiscal year		18,981,000	55,622,000	20,708,000								9,974,000	21,978,000	13,591,000
Increases due to re-measurement of fair value reported in interest expense		1,374,000	1,612,000	156,000
Net decreases due to re-measurement of fair value reported as gains in operating income		(19,246,000)	(1,755,000)	(265,000)
Currency translation adjustments		3,027,000	(743,000)	(95,000)
Earn-out payments
Reported as cash used in operating activities		(601,000)
Reported as cash used in investing activities		(11,773,000)	(22,059,000)	(13,591,000)
Reported as cash used in financing activities		(18,055,000)
Settlement of receivables due from sellers		(7,301,000)
Ending balance (at fair value)	$ 51,539,000	$ 51,539,000	$ 75,159,000	$ 20,504,000