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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Translation and Transactions, Earnings per Share, Warranty Provision, Income Taxes & Leases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jul. 31, 2018	Jul. 01, 2018	Feb. 28, 2017
Foreign Currency Translation
Transaction gain (loss)	$ 100	$ (1,300)	$ 2,000
Earnings (loss) per share:
Weighted average shares excluded from diluted earnings (loss) per share due to their anti-dilutive effect (in thousands)	40	1,280	87
Computation of basic and diluted earnings per share
Net income	$ 64,796	$ (29,127)	$ 21,076
Weighted average shares outstanding-basic	18,097	18,592	18,894
Dilutive effect of equity awards	623		795
Weighted average shares outstanding-diluted	18,720	18,592	19,689
Basic earnings (loss) per share	$ 3.58	$ (1.57)	$ 1.12
Diluted earnings (loss) per share	$ 3.46	$ (1.57)	$ 1.07
Weighted average shares excluded from diluted earnings (loss) per share due to their anti-dilutive effect (in thousands)	40	1,280	87
Changes in warranty provision
Warranty provision at beginning of period	$ 21,819	$ 15,178	$ 15,948
Warranty claims provided for/assumed in acquisition	8,867	14,156	5,793
Settlements made	(8,962)	(7,515)	(6,563)
Warranty provision at end of period	21,724	21,819	$ 15,178
Recently Adopted Accounting Pronouncements
Prepaid expenses and other assets	32,432	41,587
Deferred tax asset	$ 3,997	$ 2,607
Leases
Lease, Practical Expedients, Package	false
ASU 2016-16
Recently Adopted Accounting Pronouncements
Prepaid expenses and other assets				$ (3,000)
Deferred tax asset					$ 3,000
1.25% Convertible Senior Notes Due 2022
Earnings (loss) per share:
Interest rate (as a percentage)	1.25%					1.25%
Restatement Adjustment | ASU 2016-02
Leases
ROU assets	$ 28,000
Lease liabilities	$ 30,000

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