FAIR VALUE MEASUREMENTS - Schedule of Assets at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 62,684	$ 22,218
Deferred compensation plan assets	48,215	47,202
Total assets	111,509	74,075
Financial and nonfinancial liabilities, fair value disclosure	42,041	45,360
FFF
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FFF call right	610
Available-for-sale securities		4,655
FFF put right	42,041	24,050
Earn-out liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earn-out liabilities		21,310
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	62,684	22,218
Deferred compensation plan assets	48,215	47,202
Total assets	110,899	69,420
Financial and nonfinancial liabilities, fair value disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | FFF
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FFF call right	0
Available-for-sale securities		0
FFF put right	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Earn-out liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earn-out liabilities		0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Deferred compensation plan assets	0	0
Total assets	0	0
Financial and nonfinancial liabilities, fair value disclosure	0	0
Significant Other Observable Inputs (Level 2) | FFF
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FFF call right	0
Available-for-sale securities		0
FFF put right	0	0
Significant Other Observable Inputs (Level 2) | Earn-out liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earn-out liabilities		0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Deferred compensation plan assets	0	0
Total assets	610	4,655
Financial and nonfinancial liabilities, fair value disclosure	42,041	45,360
Significant Unobservable Inputs (Level 3) | FFF
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FFF call right	610
Available-for-sale securities		4,655
FFF put right	$ 42,041	24,050
Significant Unobservable Inputs (Level 3) | Earn-out liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earn-out liabilities		$ 21,310