FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017
Accrued Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Acquisition Obligations	$ 4.2	$ 4.3	$ 6.9
Deferred Rent and Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Acquisition Obligations	$ 13.7	$ 14.3	$ 12.7