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Acquisitions (Details Textual) - USD ($) $ in Thousands					1 Months Ended	12 Months Ended
	Jul. 03, 2017	Dec. 12, 2016	Feb. 01, 2016	Feb. 01, 2016	Aug. 31, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2018	Jun. 30, 2015
Business Acquisition [Line Items]
Goodwill						$ 113,501	$ 78,293	$ 96,162	$ 71,518
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
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
Goodwill			$ 7,030	$ 7,030
Acquisition-related expenses							$ 1,200
Subsequent Event [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses					$ 3,700

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Settlement of warranty reserve with previous owners of Houston Interests, LLC.

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Amount the Company could have to pay the previous owners, as a working capital adjustment, depending on the amount of unused acquired warranty reserve remaining as of June 30, 2017.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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