Segment information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014 segment	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting [Abstract]
Number of reporting segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 150,313	$ 191,800	$ 205,522
Property and equipment	8,814	11,753	15,442
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	141,135	177,390	193,358
Property and equipment	8,128	10,949	14,045
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	9,178	14,410	12,164
Property and equipment	$ 686	$ 804	$ 1,397