Goodwill and Intangibles (Details) (USD $)	3 Months Ended					12 Months Ended
	Dec. 30, 2012	Dec. 30, 2012 ECS item	Dec. 30, 2012 TSS	Dec. 30, 2012 RCM	Sep. 30, 2012 RCM	Sep. 30, 2012 Engineering and architecture services (EAS)	Sep. 30, 2005 Engineering and architecture services (EAS)
Goodwill
Balance at beginning of the period	$ 635,958,000	$ 412,308,000	$ 173,867,000	$ 49,783,000	$ 49,783,000
Goodwill additions	12,132,000	12,132,000
Currency translation adjustments	(3,862,000)	(3,862,000)
Goodwill adjustments	(79,000)		(79,000)
Balance at end of the period	644,149,000	420,578,000	173,788,000	49,783,000	49,783,000
Transfer out of segment		7,600,000
Transfer into segment			7,600,000
Transfer in from former segment		9,200,000	7,500,000
Number of immaterial acquisitions		2
Impairment of goodwill						$ 900,000	$ 105,000,000