Acquisitions (Details Textual) - USD ($) $ in Thousands						12 Months Ended
	Jul. 03, 2017	Dec. 12, 2016	Feb. 01, 2016	Feb. 01, 2016	Aug. 22, 2014	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Goodwill						$ 113,501	$ 78,293		$ 71,518	$ 69,837
Noncontrolling interest in joint venture						0	(1,176)
Houston Interests, LLC [Member]
Business Acquisition [Line Items]
Net purchase price		$ 42,506
Business Acquisition, Effective Date of Acquisition		Dec. 12, 2016
Net assets acquired		$ 52,837
Tax deductible goodwill		$ 35,146
Warranty reserve working capital provision						2,600
Settlement of warranty reserve	$ 1,687
Acquisition-related expenses						600
Revenue of Acquiree since Acquisition Date, Actual						33,400
Earnings of Acquiree since Acquisition Date, Actual						1,300
Baillie Tank Equipment, Ltd. [Member]
Business Acquisition [Line Items]
Net purchase price				$ 13,049
Business Acquisition, Effective Date of Acquisition			Feb. 01, 2016
Net assets acquired			$ 13,641	13,641
Economic purchase price			15,400
Goodwill			$ 7,030	$ 7,030
Acquisition-related expenses							1,200
Revenue of Acquiree since Acquisition Date, Actual						7,800	5,400
Earnings of Acquiree since Acquisition Date, Actual						$ 500	$ 300
HDB, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition					Aug. 22, 2014
Net assets acquired					$ 5,551			$ 5,600
Tax deductible goodwill					$ 3,065