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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Translation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Foreign Currency Translation
Transaction gain (loss)	$ (800)	$ 2,100	$ (1,800)
Business Combinations
Goodwill	$ 122,819	98,167	92,607
Earnings per share:
Stock option and stock awards excluded from computation due to anti-dilutive effect (in shares)	100
Computation of basic and diluted earnings per share
Net income available to common stockholders	$ 26,157	$ 65,151	$ 47,894
Weighted average shares outstanding- basic	19,427	19,799	19,952
Dilutive effect of stock options (in shares)	649	727	635
Weighted average shares outstanding- diluted	20,076	20,526	20,587
Basic earnings per share (in dollars per share)	$ 1.35	$ 3.29	$ 2.40
Diluted earnings per share (in dollars per share)	$ 1.30	$ 3.17	$ 2.33
Changes in warranty provision
Warranty provision at beginning of period	$ 12,738	$ 11,923	$ 12,890
Warranty claims provision	12,296	6,043	5,573
Settlements made	(9,086)	(5,228)	(6,540)
Warranty provision at end of period	15,948	$ 12,738	$ 11,923
Series of Individually Immaterial Business Acquisitions
Business Combinations
Cash payments at closing	17,800
Goodwill	25,300
Intangible assets acquired	8,300
Series of Individually Immaterial Business Acquisitions | Trademarks and trade names
Business Combinations
Intangible assets acquired	900
Series of Individually Immaterial Business Acquisitions | Non-compete covenants
Business Combinations
Intangible assets acquired	200
Series of Individually Immaterial Business Acquisitions | Technology
Business Combinations
Intangible assets acquired	1,200
Series of Individually Immaterial Business Acquisitions | Customer relationships
Business Combinations
Intangible assets acquired	6,000
Series of Individually Immaterial Business Acquisitions | Indemnity holdbacks
Business Combinations
Contingent consideration	2,600
Series of Individually Immaterial Business Acquisitions | Fair value
Business Combinations
Contingent consideration	$ 13,800

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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