Reportable Segments (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 27, 2015 USD ($)	Jun. 28, 2015 USD ($)	Mar. 29, 2015 USD ($)	Dec. 28, 2014 USD ($)	Sep. 28, 2014 USD ($)	Jun. 29, 2014 USD ($)	Mar. 30, 2014 USD ($)	Dec. 29, 2013 USD ($)	Sep. 27, 2015 USD ($) segment	Sep. 28, 2014 USD ($)	Sep. 29, 2013 USD ($)
Financial information concerning reportable segments
Number of reportable segments | segment									2
Revenue	$ 578,394	$ 575,108	$ 564,763	$ 581,056	$ 622,179	$ 629,502	$ 586,285	$ 645,848	$ 2,299,321	$ 2,483,814	$ 2,613,755
Operating income (loss)	(20,047)	$ 40,721	$ 30,398	$ 36,612	24,762	$ 39,167	$ 46,186	$ 43,718	87,684	153,833	20,218
Depreciation									23,110	26,452	29,548
Impairment charge	60,800								60,800
Amortization expense for intangible assets									20,200	27,300	32,400
Fair value adjustments to contingent consideration liabilities									3,113	58,694	9,560
Total assets	1,559,242				1,776,404				1,559,242	1,776,404
WEI
Financial information concerning reportable segments
Revenue									938,469	946,849	963,592
Operating income (loss)									92,920	93,972	59,924
Depreciation									4,763	5,627	7,918
Total assets	267,576				302,877				267,576	302,877
RME
Financial information concerning reportable segments
Revenue									1,342,889	1,406,885	1,389,711
Operating income (loss)									93,581	84,743	74,796
Depreciation									13,914	14,764	15,295
Total assets	441,662				442,911				441,662	442,911
RCM
Financial information concerning reportable segments
Revenue									86,575	221,108	305,821
Operating income (loss)					(35,100)				(8,614)	(45,151)	(24,986)
Depreciation									1,801	2,958	3,280
Total assets	57,612				100,996				57,612	100,996
Inter-segment elimination
Financial information concerning reportable segments
Revenue									(68,612)	(91,028)	(45,369)
Corporate.
Financial information concerning reportable segments
Operating income (loss)									(90,203)	20,269	(89,516)
Depreciation									2,632	3,103	3,055
Impairment charge									60,800		56,600
Amortization expense for intangible assets									20,200	27,300	32,400
Fair value adjustments to contingent consideration liabilities									3,100	58,700	$ 9,600
Total assets	$ 792,392				$ 929,620				$ 792,392	$ 929,620