ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Purchase Price Allocation
Goodwill	$ 133,082		$ 132,035
Dover Downs
Purchase Price Allocation
Cash	19,500	$ 19,500
Accounts receivable	5,674	5,674
Due from State of Delaware	2,535	2,535
Inventory	1,393	1,891
Prepaid expenses and other assets	2,479	2,586
Property and equipment	98,279	103,657
Right of use asset	1,333	1,333
Intangible assets	5,110	5,110
Deferred income tax assets	11,879	6,655
Other assets	320	320
Goodwill	1,047	0
Accounts payable	(7,373)	(7,470)
Purses due to horseman	(2,613)	(2,613)
Accrued and other current liabilities	(13,513)	(13,014)
Lease obligations	(1,333)	(1,333)
Pension benefit obligations	(6,613)	(6,613)
Other long-term liabilities	(2,218)	(2,332)
Total purchase price	115,886	$ 115,886
Purchase Price Allocation Adjustment
Cash	0
Accounts receivable	0
Due from State of Delaware	0
Inventory	(498)
Prepaid expenses and other assets	(107)
Property and equipment	(5,378)
Right of use asset	0
Intangible assets	0
Deferred income tax assets	5,224
Other assets	0
Goodwill	1,047
Accounts payable	97
Purses due to horseman	0
Accrued and other current liabilities	(499)
Lease obligations	0
Pension benefit obligations	0
Other long-term liabilities	114
Total purchase price	$ 0