INDEBTEDNESS - Additional information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 27, 2018	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 01, 2019	Nov. 29, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortization of Debt Issuance Costs		$ 182	$ 360
Debt Instrument, Maturity Date	Dec. 01, 2019
Long-term Debt, Current Maturities		11,872			$ 9,941
Delayed Draw Term Loan [Member]
Debt Issuance Costs, Current and Noncurrent		400
Line of Credit Facility, Maximum Borrowing Capacity	$ 118,000
Delayed Draw Term Loan [Member] | Maximum
Debt Instrument, Basis Spread on Variable Rate				2.75%
Delayed Draw Term Loan [Member] | Minimum
Debt Instrument, Basis Spread on Variable Rate				1.50%
Senior Secured Credit Facility [Member]
Debt Instrument, Description of Variable Rate Basis	LIBOR rate plus 1.50% to 2.75% per annum, depending on our total leverage ratio or an alternative base rate plus an applicable base rate margin, which varies within a range of 0.50% to 1.75%,
Debt Instrument, Covenant Description	which is,as of March 31, 2020, no greater than 3.50 to 1.00 and a minimum fixed charge coverage ratio, which shall be greater than or equal to 1.25 to 1.00.
Line of Credit Facility, Maximum Borrowing Capacity	$ 265,200
Senior Secured Credit Facility [Member] | Delayed Draw Term Loan [Member]
Long-term Debt, Gross		118,000
Revolving Credit Facility [Member] | Accrued Liabilities [Member]
Debt Issuance Costs, Noncurrent, Net		800
Revolving Credit Facility [Member] | Delayed Draw Term Loan [Member]
Long-term Debt, Gross							$ 118,000
Long-term Debt, Current Maturities		7,400
Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 125,000
Prepaid Expenses and Other Current Assets [Member] | Revolving Credit Facility [Member]
Debt Issuance Costs, Current, Net		200
Prepaid Expenses and Other Current Liabilities [Member] | Delayed Draw Term Loan [Member]
Debt Issuance Costs, Current, Net		300
Other Long-Term Assets [Member] | Delayed Draw Term Loan [Member]
Debt Issuance Costs, Noncurrent, Net		100
Other Long-Term Assets [Member] | Revolving Credit Facility [Member]
Debt Issuance Costs, Noncurrent, Net		700
Line of Credit Facility, Maximum Borrowing Capacity		75,000							$ 50,000
Convertible Senior Notes [Member]
Short-term Debt, Percentage Bearing Fixed Interest Rate						3.00%
Line of Credit [Member]
Debt Issuance Costs, Current and Noncurrent		900
Line of Credit Facility, Remaining Borrowing Capacity		60,000
Proceeds from exercise of option to borrow		$ 15,000
Line of Credit [Member] | Maximum
Line of Credit Facility, Commitment Fee Percentage		0.50%
Line of Credit [Member] | Minimum
Line of Credit Facility, Commitment Fee Percentage		0.25%
Term Loan [Member] | Senior Secured Credit Facility [Member]
Long-term Debt, Gross		$ 68,600						$ 72,200
Debt Issuance Costs, Net		1,200
Debt Instrument, Face Amount	$ 72,200							$ 72,200
Debt Instrument, Maturity Date	Dec. 27, 2023
Long-term Debt, Current Maturities		$ 5,000
Term Loan [Member] | Senior Secured Credit Facility [Member] | Maximum
Debt Instrument, Basis Spread on Variable Rate		1.75%
Term Loan [Member] | Senior Secured Credit Facility [Member] | Minimum
Debt Instrument, Basis Spread on Variable Rate		0.50%
Term Loan [Member] | Prepaid Expenses and Other Current Assets [Member] | Senior Secured Credit Facility [Member]
Debt Issuance Costs, Current, Net		$ 400