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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Taxes
Other income tax rate reconciling items (as a percent)	(27.80%)	(4.80%)	(10.00%)
Rate impact of meals and entertainment expense disallowance (as a percent)	(5.50%)		(6.00%)
Rate impact of miscellaneous items (as a percent)	8.10%		(4.00%)
Tax credit carryforward amount subject to expiration	$ 32.9
Undistributed earnings of international subsidiaries	10.2
Reserve on unrecognized tax benefits that would benefit the effective tax rate	0.9
Interest and penalties	0.1	$ 0.1	$ 0.1
Accrued interest and penalties related to unrecognized tax benefits	1.1
Domestic Tax Authority
Income Taxes
Operating loss carryforwards	21.4
State Tax Authority
Income Taxes
Operating loss carryforwards	6.6
Foreign Tax Authority \| Canada Revenue Agency
Income Taxes
Operating loss carryforwards	0.2
Foreign Tax Authority \| Her Majesty's Revenue and Customs (HMRC)
Income Taxes
Operating loss carryforwards	1.0
Expiring from 2028 to 2035
Income Taxes
Tax credit carryforward amount subject to expiration	30.9
Expiring from 2020 to 2025
Income Taxes
Tax credit carryforward amount subject to expiration	0.5
Tax Credit Carryforward, Without Expiration
Income Taxes
Tax credit carryforward amount subject to expiration	$ 1.5