Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Quarterly Financial Data (Unaudited)
Total revenue	$ 101,532	$ 103,587	$ 98,769	$ 87,565	$ 83,264	$ 79,357	$ 77,309	$ 71,457	$ 391,453	$ 311,387	$ 243,134
Gross profit	88,653	88,299	86,326	75,487	70,276	66,708	64,936	59,119	338,765	261,039	190,857
Income from operations	37,361	31,402	36,112	24,849	15,383	16,334	14,929	8,954	129,724	55,600	(15,007)
Net (loss) income	$ 26,678	$ 20,843	$ 23,263	$ 14,999	$ 20,399	$ 10,513	$ 9,937	$ 4,413	$ 85,783	$ 45,262	$ (13,808)
Net (loss) income per common share:
Basic (in dollars per share)	$ 0.29	$ 0.23	$ 0.25	$ 0.16	$ 0.28	$ 0.11	$ 0.11	$ 0.05	$ 0.93	$ 0.48	$ (0.15)
Diluted (in dollars per share)	$ 0.29	$ 0.22	$ 0.25	$ 0.16	$ 0.28	$ 0.11	$ 0.10	$ 0.05	$ 0.92	$ 0.47	$ (0.15)
Weighted average shares outstanding:
Basic (in shares)	91,916	92,414	92,839	93,410	93,680	93,730	93,512	93,428	92,648	93,586	93,780
Diluted (in shares)	92,710	93,365	93,816	94,522	95,257	95,400	95,463	95,670	93,665	95,410	93,780