Statements of Operations-Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Depreciation and amortization
Depreciation of property, plant and equipment	$ 4,066	$ 3,920	$ 12,417	$ 11,878
Amortization of intangible assets	1,233	$ 1,202	3,359	$ 3,737
Amortization of other assets	57		174
Depreciation and amortization	$ 5,356	$ 5,122	$ 15,950	$ 15,615