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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per Share (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($)	Jun. 30, 2020 USD ($) item $ / shares shares	Jun. 30, 2019 USD ($) item $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Feb. 28, 2017
Foreign Currency Translation
Transaction gain (loss)		$ (3,400)	$ 100	$ (1,300)
Acquisition Activity
Goodwill		310,627	307,108	292,213
Computation of basic and diluted earnings per share
Net income (loss)		$ 75,252	$ 64,796	$ (29,127)
Weighted average shares outstanding-basic | shares		18,191	18,097	18,592
Dilutive effect of equity awards | shares		409	623
Weighted average shares outstanding-diluted | shares		18,600	18,720	18,592
Basic earnings (loss) per share | $ / shares		$ 4.14	$ 3.58	$ (1.57)
Diluted earnings (loss) per share | $ / shares		$ 4.05	$ 3.46	$ (1.57)
Weighted average stock options excluded from computation due to antidilutive effect | shares		120	40	1,280
Warranty Provision
Warranty provision at beginning of period		$ 21,724	$ 21,819	$ 15,178
Warranty claims provided for/assumed in acquisition		7,551	8,867	14,156
Settlements made		(8,450)	(8,962)	(7,515)
Warranty provision at end of period		$ 20,825	$ 21,724	$ 21,819
Other business acquisitions
Acquisition Activity
Number of business acquisitions consummated during the year | item		4	3
Consideration paid		$ 8,900	$ 18,300
An electronics component designer and manufacturer
Acquisition Activity
Consideration paid	$ 22,000
Goodwill	14,000
Total intangible assets	$ 12,600
1.25% Convertible Senior Notes Due 2022
Computation of basic and diluted earnings per share
Interest rate (as a percentage)		1.25%			1.25%

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