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Statements of Operations-Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Interest expense, net        
Amortization of debt issuance costs and debt discount $ 221 $ 253 $ 662 $ 761
Acquisition-related accrued interest 290 459 795 1,314
Other 45 37 286 165
Interest expense 3,293 4,250 10,043 13,198
Interest (income) (229) (321) (811) (1,490)
Interest expense, net 3,064 3,929 9,232 11,708
Depreciation and amortization        
Depreciation of property, plant and equipment 5,261 5,400 15,666 15,083
Amortization of intangible assets 1,477 1,436 4,323 4,398
Amortization of other assets 13 6 37 123
Depreciation and amortization 6,751 6,842 20,026 19,604
Term loan        
Interest expense, net        
Interest expense 2,071 2,859 6,214 8,630
Revolving credit facility        
Interest expense, net        
Interest expense $ 666 $ 642 $ 2,086 $ 2,328