Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Sep. 28, 2014
Financial information concerning reportable segments
Revenue	$ 575,108	$ 629,502	$ 1,720,927	$ 1,861,635
Operating income (loss)	40,721	39,167	107,732	129,070
Depreciation	5,319	6,454	18,112	20,160
Total assets	1,703,522		1,703,522		$ 1,776,404
Inter-segment elimination
Financial information concerning reportable segments
Revenue	(14,329)	(23,631)	(51,984)	(69,329)
Corporate
Financial information concerning reportable segments
Operating income (loss)	(7,296)	144	(19,961)	8,940
Depreciation	516	839	2,207	2,330
Corporate
Financial information concerning reportable segments
Total assets	948,084		948,084		929,620
WEI | Operating segment
Financial information concerning reportable segments
Revenue	242,285	238,744	699,319	692,051
Operating income (loss)	24,611	20,706	62,231	61,228
Depreciation	1,211	1,305	3,633	4,081
Total assets	259,072		259,072		302,877
RME | Operating segment
Financial information concerning reportable segments
Revenue	330,686	347,306	1,004,546	1,049,466
Operating income (loss)	23,596	24,239	69,067	68,225
Depreciation	3,355	3,608	10,699	11,478
Total assets	434,493		434,493		442,911
RCM | Operating segment
Financial information concerning reportable segments
Revenue	16,466	67,083	69,046	189,447
Operating income (loss)	(190)	(5,922)	(3,605)	(9,323)
Depreciation	237	$ 702	1,573	$ 2,271
Total assets	$ 61,873		$ 61,873		$ 100,996