Goodwill and Intangibles (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended					12 Months Ended
	Jun. 30, 2013 item	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 ECS	Jun. 30, 2013 TTC, GMP and AMT	Jun. 30, 2013 TTC	Jun. 30, 2013 GMP	Jun. 30, 2013 AMT	Jun. 30, 2013 TSS	Jun. 30, 2013 RCM	Sep. 30, 2012 Engineering and architecture services (EAS)	Oct. 02, 2005 Engineering and architecture services (EAS)
Goodwill and Intangibles
Number of reporting units for which goodwill impairment test is triggered	3
Goodwill information
Goodwill impairment, net of tax					$ 48,100,000
Carrying value before impairment						245,634,000	116,184,000	56,474,000
Goodwill impairment	(56,600,000)	(56,600,000)	0	(56,600,000)	(56,600,000)	(27,900,000)	(11,900,000)	(16,800,000)			(900,000)	(105,000,000)
Carrying value after impairment						217,734,000	104,284,000	39,674,000
Goodwill
Balance at beginning of the period		635,958,000		412,308,000					173,867,000	49,783,000
Goodwill acquired		155,610,000		12,306,000						143,304,000
Foreign exchange impact		(27,055,000)		(21,748,000)						(5,307,000)
Post-acquisition adjustments		2,408,000		2,058,000					350,000
Goodwill impairment	(56,600,000)	(56,600,000)	0	(56,600,000)	(56,600,000)	(27,900,000)	(11,900,000)	(16,800,000)			(900,000)	(105,000,000)
Balance at end of the period	710,321,000	710,321,000	635,958,000	348,324,000		111,100,000	72,300,000	32,600,000	174,217,000	187,780,000
Transfer into segment									7,600,000
Transfer out of segment				7,600,000
Transfer in from former segment				$ 9,200,000					$ 7,500,000