Goodwill and Intangibles (Details 2) (USD $)	3 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Sep. 30, 2012
Finite-lived intangible assets
Gross Amount	$ 177,000,000		$ 167,528,000
Accumulated Amortization	(98,310,000)		(93,297,000)
Amortization expense for intangible assets	5,600,000	8,300,000
Estimated amortization expense
2013	14,717,000
2014	16,212,000
2015	15,180,000
2016	13,543,000
2017	11,134,000
Beyond	7,904,000
Total	78,690,000
Non-compete agreements
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	2.8
Gross Amount	6,316,000		5,467,000
Accumulated Amortization	(4,938,000)		(4,685,000)
Client relations
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	5.3
Gross Amount	107,439,000		99,096,000
Accumulated Amortization	(35,116,000)		(31,477,000)
Backlog
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	0.9
Gross Amount	60,109,000		59,931,000
Accumulated Amortization	(56,863,000)		(55,908,000)
Technology and trade names
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	3.6
Gross Amount	3,136,000		3,034,000
Accumulated Amortization	$ (1,393,000)		$ (1,227,000)