Goodwill and Intangible Assets (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013
Finite-lived intangible assets
Gross Amount	$ 112,116	$ 127,484
Accumulated Amortization	(71,784)	(64,389)
Foreign currency translation adjustments	4,400
Amortization expense for intangible assets	20,200	27,300	$ 32,400
Estimated amortization expense
2016	15,290
2017	12,718
2018	5,856
2019	2,989
2020	2,418
Beyond	1,061
Total	$ 40,332
Non-compete agreements
Finite-lived intangible assets
Weighted-Average Remaining Life	1 year 1 month 6 days
Gross Amount	$ 819	1,086
Accumulated Amortization	$ (587)	(524)
Client relations
Finite-lived intangible assets
Weighted-Average Remaining Life	3 years 4 months 24 days
Gross Amount	$ 106,676	122,198
Accumulated Amortization	$ (67,726)	(61,117)
Backlog
Finite-lived intangible assets
Weighted-Average Remaining Life	7 months 6 days
Gross Amount	$ 2,115	1,283
Accumulated Amortization	$ (1,444)	(1,072)
Technology and trade names
Finite-lived intangible assets
Weighted-Average Remaining Life	1 year 4 months 24 days
Gross Amount	$ 2,506	2,917
Accumulated Amortization	$ (2,027)	$ (1,676)