Reportable Segments (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended				12 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Sep. 30, 2012	Jun. 30, 2013 ECS	Jul. 01, 2012 ECS	Jun. 30, 2013 ECS	Jul. 01, 2012 ECS	Sep. 30, 2012 ECS	Jun. 30, 2013 TSS	Jul. 01, 2012 TSS	Jun. 30, 2013 TSS	Jul. 01, 2012 TSS	Sep. 30, 2012 TSS	Jun. 30, 2013 RCM	Jul. 01, 2012 RCM	Jun. 30, 2013 RCM	Jul. 01, 2012 RCM	Sep. 30, 2012 RCM	Jun. 30, 2013 Corporate	Jul. 01, 2012 Corporate	Jun. 30, 2013 Corporate	Jul. 01, 2012 Corporate	Jun. 30, 2013 Assets not allocated to segments and intercompany eliminations	Sep. 30, 2012 Assets not allocated to segments and intercompany eliminations	Sep. 30, 2012 Engineering and architecture services (EAS)	Oct. 02, 2005 Engineering and architecture services (EAS)
Financial information concerning reportable segments
Revenue	$ 614,835,000	$ 684,698,000	$ 1,915,379,000	$ 1,991,670,000		$ 251,239,000	$ 296,995,000	$ 788,600,000	$ 856,050,000		$ 221,198,000	$ 258,435,000	$ 687,230,000	$ 762,897,000		$ 162,560,000	$ 153,826,000	$ 499,491,000	$ 432,043,000		$ (20,162,000)	$ (24,558,000)	$ (59,942,000)	$ (59,320,000)
Operating (Loss) Income	(99,884,000)	46,261,000	(20,409,000)	117,896,000		(7,700,000)	27,124,000	22,793,000	70,075,000		5,118,000	20,658,000	49,723,000	57,602,000		(35,285,000)	6,184,000	(14,109,000)	16,073,000		(62,017,000)	(7,705,000)	(78,816,000)	(25,854,000)
Depreciation	8,090,000	6,077,000	22,420,000	19,657,000		2,941,000	1,852,000	8,154,000	7,403,000		723,000	749,000	2,198,000	2,432,000		3,700,000	2,674,000	9,735,000	7,547,000		726,000	802,000	2,333,000	2,275,000
Goodwill impairment charge	56,600,000		56,600,000		0			56,600,000													56,600,000		56,600,000				900,000	105,000,000
Amortization expense for intangible assets	9,600,000	6,900,000	24,200,000	22,100,000																	9,600,000	6,900,000	24,200,000	22,100,000
Total assets	$ 1,771,512,000		$ 1,771,512,000		$ 1,671,030,000	$ 910,453,000		$ 910,453,000		$ 915,571,000	$ 673,799,000		$ 673,799,000		$ 638,405,000	$ 413,032,000		$ 413,032,000		$ 311,051,000					$ (225,772,000)	$ (193,997,000)