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Impairment, restructuring and other charges (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2015
Impairment, Restructuring and Other Charges [Line Items]          
Impairment of fixed assets $ 5,888   $ 5,888    
Impairment of minority interest investment 2,853   2,853    
Total impairment charges 8,741   8,741    
Employee termination costs 542 $ 80 542 $ 324  
Charges related to government contract issues   1,737   1,766  
Charges related to class action litigation   182   625  
Legal settlement and related costs 1,718   1,718    
Other 96 80 96 90  
Total impairment, restructuring and other charges 11,097 $ 2,079 11,097 $ 2,805  
Other accrued expenses          
Impairment, Restructuring and Other Charges [Line Items]          
Accrued restructuring and other charges $ 2,400   $ 2,400   $ 3,400