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 Information Disclosure [Abstract]
Revenue	$ 34,385	$ 34,471	$ 37,161	$ 44,296	$ 47,062	$ 54,987	$ 47,229	$ 42,522	$ 150,313	$ 191,800	$ 205,522
Gross profit	19,006	20,232	21,987	28,247	28,600	33,310	29,948	30,829	89,472	122,687	161,074
Income (loss) from continuing operations, net of tax	(17,981)	(7,555)	(3,997)	9	(879)	3,821	418	2,221	(29,524)	5,581	31,806
Income from discontinued operations, net of tax	0	0	0	0	6,487	33	486	480	0	7,486	602
Net income (loss)	$ (17,981)	$ (7,555)	$ (3,997)	$ 9	$ 5,608	$ 3,854	$ 904	$ 2,701	$ (29,524)	$ 13,067	$ 32,408
Basic income (loss) per share:
Basic income per share - Income (loss) from continuing operations (in dollars per share)	$ (0.46)	$ (0.19)	$ (0.10)	$ 0.00	$ (0.02)	$ 0.10	$ 0.01	$ 0.06	$ (0.76)	$ 0.14	$ 0.77
Basic income per share - income (loss) from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.16	$ 0.00	$ 0.01	$ 0.01	$ 0.00	$ 0.18	$ 0.01
Net income (loss)- basic (in dollars per share)	$ (0.46)	$ (0.19)	$ (0.10)	$ 0.00	$ 0.14	$ 0.10	$ 0.02	$ 0.07	$ (0.76)	$ 0.32	$ 0.78
Diluted income (loss) per share:
Diluted income per share - Income (loss) from continuing operations (in dollars per share)	$ (0.46)	$ (0.19)	$ (0.10)	$ 0.00	$ (0.02)	$ 0.09	$ 0.01	$ 0.05	$ (0.76)	$ 0.13	$ 0.72
Diluted income per share - Income (loss) from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.16	$ 0.00	$ 0.01	$ 0.01	$ 0.00	$ 0.18	$ 0.02
Net income (loss) diluted (in dollars per share)	$ (0.46)	$ (0.19)	$ (0.10)	$ 0.00	$ 0.14	$ 0.09	$ 0.02	$ 0.06	$ (0.76)	$ 0.31	$ 0.74