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Debt - Summary of long-term debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Debt Instrument [Line Items]    
Capitalized lease obligations $ 25 $ 18
Long-term debt and capital lease obligations, gross 286,400 287,118
Unamortized debt discount (574) (600)
Long-term debt and capital lease obligations, net 285,826 286,518
Less: current maturities (2,819) (2,809)
Total 283,007 283,709
Term B loan due April 15, 2021    
Debt Instrument [Line Items]    
Long-term debt, gross $ 286,375 $ 287,100