Goodwill and Intangibles (Details) (USD $)	6 Months Ended				12 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 ECS	Mar. 31, 2013 TSS	Mar. 31, 2013 RCM	Sep. 30, 2012 Engineering and architecture services (EAS)	Oct. 02, 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
Goodwill additions	153,358,000	12,231,000		141,127,000
Currency translation adjustments	(11,499,000)	(9,624,000)		(1,875,000)
Goodwill adjustments	(78,000)		(78,000)
Balance at end of the period	777,739,000	414,915,000	173,789,000	189,035,000
Transfer out of segment		7,600,000
Transfer into segment			7,600,000
Transfer in from former segment		9,200,000	7,500,000
Impairment of goodwill					$ 900,000	$ 105,000,000