RIGHT-OF-USE ASSETS AND LEASES - Narrative (Details) $ in Millions		3 Months Ended	6 Months Ended
	Jul. 03, 2019 USD ($) ft² term story	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Term of contract	132 months
Renewal term	5 years
Operating lease expense		$ 4.2	$ 6.2
Amount of lease not yet commenced		$ 2.2	$ 2.2
Number of renewal terms | term	2
Base rent	$ 0.7
Annual percentage increase in base rent	3.00%
Tenant improvements	$ 15.4
Security deposit	2.0
Increase in operating lease right-of-use asset	56.8
Increase in operating lease liability	$ 56.1
Minimum
Lessee, Lease, Description [Line Items]
Term of contract		1 year	1 year
Renewal term		1 year	1 year
Maximum
Lessee, Lease, Description [Line Items]
Term of contract		11 years	11 years
Renewal term		5 years	5 years
Property Held Under Operating Lease
Lessee, Lease, Description [Line Items]
Area of real estate property | ft²	177,815
Number of building stories | story	5