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Statements of Operations-Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Depreciation and amortization    
Depreciation of property, plant and equipment $ 4,111 $ 4,228
Amortization of intangible assets 1,259 1,069
Amortization of other assets 59 56
Depreciation and amortization 5,429 5,353
Statements Of Operations Additional Information [Line Items]    
Acquisition related accrued interest 345  
Amortization of deferred financing fees, debt discount and imputed interest 242 242
Other 86 113
Interest expense 3,868 3,552
Interest (income) (49) (62)
Interest expense, net 3,819 3,490
Term B Loan    
Statements Of Operations Additional Information [Line Items]    
Interest expense 2,935 2,964
Revolving credit facility    
Statements Of Operations Additional Information [Line Items]    
Interest expense $ 260 $ 233