SUMMARY OF ACCOUNTING POLICIES - Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Apr. 01, 2019	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease liabilities	$ 643,054
Operating lease right-of-use assets, net	605,070		$ 0
Current operating lease liabilities	$ 114,100
Current operating lease liabilities, statement of financial position	us-gaap:AccruedLiabilitiesCurrent
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease liabilities		$ 658,000
Operating lease right-of-use assets, net		624,000
Deferred gain on sale leaseback transactions		$ (22,000)