Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended											12 Months Ended
	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Summary of revenues and long lived assets according to geographic areas
Revenues	$ 235,560	[1]	$ 225,970	$ 221,436	[2]	$ 209,608	$ 184,862	[1]	$ 183,899	$ 200,964	$ 169,321	$ 892,574	$ 739,046	$ 627,052
Long-Lived Assets	113,959						91,422					113,959	91,422	90,005
Domestic [Member]
Summary of revenues and long lived assets according to geographic areas
Revenues												814,879	674,496	596,756
Long-Lived Assets	101,581						85,290					101,581	85,290	83,312
International [Member]
Summary of revenues and long lived assets according to geographic areas
Revenues												77,695	64,550	30,296
Long-Lived Assets	$ 12,378						$ 6,132					$ 12,378	$ 6,132	$ 6,693

[1] The fourth quarter of fiscal 2013 includes a pretax charge on a Canadian project of $0.6 million. The fourth quarter of fiscal 2012 included an income tax charge of $3.1 million. The income tax charge represents adjustments of $2.1 million for prior fiscal years and $1.0 million in fiscal 2012, of which $0.2 million related to fourth quarter activity.

[2] The second quarter of fiscal 2013 includes a pretax charge on a Canadian project of $3.3 million