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Statements of Operations-Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Depreciation and amortization      
Depreciation of property, plant and equipment $ 16,439 $ 14,917 $ 14,425
Amortization of intangible assets 4,897 4,106 3,048
Amortization of other assets 117    54
Depreciation and amortization 21,453 19,023 17,527
Research and development expenditures $ 8,212 $ 6,638 $ 7,189