Interim Financial Results (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
Summary of selected quarterly financial information
Revenue, net	$ 56,038	$ 55,064	$ 51,538	$ 51,328	$ 51,511	$ 50,370	$ 53,438	$ 52,859	$ 213,968	$ 208,178	$ 126,183
Gross profit	47,056	46,605	43,594	43,519	44,222	43,501	38,760	45,052	180,774	171,535	108,131
Net income	$ 2,351	$ 2,494	$ 3,282	$ 3,256	$ (182)	$ 3,416	$ 209	$ 4,165	$ 11,383	$ 7,608	$ 12,469
Per common share:
Basic (dollars per shares)	$ 0.02	$ 0.02	$ 0.03	$ 0.03	$ 0.00	$ 0.03	$ 0.00	$ 0.04	$ 0.11	$ 0.07	$ 0.12
Diluted (dollars per share)	$ 0.02	$ 0.02	$ 0.03	$ 0.03	$ 0.00	$ 0.03	$ 0.00	$ 0.03	$ 0.10	$ 0.06	$ 0.11