Goodwill and Intangibles (Details 2) (USD $)	3 Months Ended	12 Months Ended
	Jan. 01, 2012	Oct. 02, 2011
Finite-lived intangible assets
Gross Amount	$ 144,961,000	$ 142,416,000
Accumulated Amortization	(70,392,000)	(61,363,000)
Amortization expense for intangible assets	8,300,000	6,800,000
Estimated amortization expense
2012	18,951,000
2013	12,291,000
2014	11,203,000
2015	10,910,000
2016	9,388,000
Beyond	11,826,000
Total	74,569,000
Non-compete agreements
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	1.7
Gross Amount	5,257,000	5,175,000
Accumulated Amortization	(3,756,000)	(3,430,000)
Client relations
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	6.0
Gross Amount	83,326,000	81,619,000
Accumulated Amortization	(21,390,000)	(17,951,000)
Backlog
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	0.7
Gross Amount	53,623,000	52,938,000
Accumulated Amortization	(44,547,000)	(39,452,000)
Technology and trade names
Finite-lived intangible assets
Weighted-Average Remaining Life (in years)	4.4
Gross Amount	2,755,000	2,684,000
Accumulated Amortization	$ (699,000)	$ (530,000)