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DEBT AND OTHER FINANCING ARRANGEMENTS - Other Long-Term Borrowings (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Nov. 09, 2017
Debt Instrument [Line Items]
Capital lease obligations	$ 0.3	$ 0.4
Cantaloupe
Debt Instrument [Line Items]
Long-term debt	$ 1.3	1.4	$ 1.8
Cantaloupe \| Notes due April 2020
Debt Instrument [Line Items]
Percentage of interest rates	5.00%
Long-term debt	$ 0.4	0.4
Cantaloupe \| Notes due September 2021
Debt Instrument [Line Items]
Percentage of interest rates	10.00%
Long-term debt	$ 0.6	0.7
Cantaloupe \| Notes due December 2019
Debt Instrument [Line Items]
Percentage of interest rates	12.00%
Long-term debt	$ 0.2	$ 0.3
Minimum
Debt Instrument [Line Items]
Capital lease obligations term	2 years
Minimum \| Capital Lease Obligations - Office and Network Equipment
Debt Instrument [Line Items]
Percentage of interest rates	5.60%
Maximum
Debt Instrument [Line Items]
Capital lease obligations term	5 years
Maximum \| Capital Lease Obligations - Office and Network Equipment
Debt Instrument [Line Items]
Percentage of interest rates	9.00%