Acquisitions (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 15, 2017	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017
Business Acquisition [Line Items]
Payment for Contingent Consideration Liability, Investing Activities		$ (4,250)
Sales		258,711		$ 221,026
Payments to Acquire Property, Plant, and Equipment		$ 5,062		$ 12,718
Effective Income Tax Rate Reconciliation, Percent		22.50%		39.50%
Futura Industries [Member]
Business Acquisition [Line Items]
Business Combinations Accretion to Diluted Earnings Per Share
Business Combination Contract Price	$ 92,000
Business Combination, Consideration Transferred	87,000
Business Combination, Contingent Consideration, Asset, Current		5,000
Business Combinations Purchase Price Allocated Net of Contingent Consideration	$ 82,860
Payment for Contingent Consideration Liability, Investing Activities		4,300
Tax Recovery Life of Goodwill for Amortization	15 years
Percentage of outstanding equity interests acquired	100.00%
Goodwill, Purchase Accounting Adjustments			$ 100
Aluminum Extrusions
Business Acquisition [Line Items]
Income Loss From Ongoing Operations		$ 10,199		$ 9,829
Customer Relationships [Member] | Futura Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Trade Names [Member] | Futura Industries [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	13 years