Goodwill and Intangible Assets (Details 2) (USD $)	3 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Sep. 29, 2013
Finite-lived intangible assets
Gross Amount	$ 138,187,000		$ 208,171,000
Accumulated Amortization	(59,501,000)		(121,242,000)
Identifiable intangible assets added on acquisition	2,200,000
Foreign currency translation adjustments	1,800,000
Amortization expense for identifiable intangible assets	8,600,000	5,600,000
Estimated amortization expense
2014	18,914,000
2015	19,563,000
2016	15,637,000
2017	13,346,000
2018	6,289,000
Beyond	4,937,000
Total	78,686,000
Non-compete agreements
Finite-lived intangible assets
Weighted-Average Remaining Life	2 years 7 months 6 days
Gross Amount	2,149,000		6,160,000
Accumulated Amortization	(1,268,000)		(5,247,000)
Client relations
Finite-lived intangible assets
Weighted-Average Remaining Life	4 years 3 months 18 days
Gross Amount	121,335,000		128,839,000
Accumulated Amortization	(47,567,000)		(49,189,000)
Backlog
Finite-lived intangible assets
Weighted-Average Remaining Life	6 months
Gross Amount	11,336,000		68,968,000
Accumulated Amortization	(9,191,000)		(64,675,000)
Technology and trade names
Finite-lived intangible assets
Weighted-Average Remaining Life	2 years 8 months 12 days
Gross Amount	3,367,000		4,204,000
Accumulated Amortization	$ (1,475,000)		$ (2,131,000)