Acquisitions (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Dec. 12, 2016	Feb. 01, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Houston Interests, LLC [Member]
Business Acquisition [Line Items]
Current assets	$ 21,804
Business Acquisition, Effective Date of Acquisition	Dec. 12, 2016
Business Acquisition, Name of Acquired Entity	Houston Interests, LLC
Business Combination, Consideration Transferred	$ 40,819
Acquisition costs			$ 100		$ 500
Revenue of Acquiree since Acquisition Date, Actual			14,100		16,400
Earnings of Acquiree since Acquisition Date, Actual			(100)		(400)
Baillie Tank Equipment, Ltd. [Member]
Business Acquisition [Line Items]
Current assets		$ 5,574
Business Acquisition, Effective Date of Acquisition		Feb. 01, 2016
Business Acquisition, Name of Acquired Entity		Baillie Tank Equipment, Ltd. (“BTE”)
Business Combination, Consideration Transferred		$ 13,049
Economic purchase price		$ 15,400
Acquisition costs				$ 800		$ 900
Revenue of Acquiree since Acquisition Date, Actual			3,000		5,800	3,500
Earnings of Acquiree since Acquisition Date, Actual			$ 0		$ 300	$ 700