STOCKHOLDERS' EQUITY - TREASURY STOCK (Details) - Convertible Debt - Convertible Notes - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Apr. 29, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Class of Stock [Line Items]
Treasury stock, shares acquired (shares)	272,100
Treasury stock acquired	$ 2.7
Forward Stock Purchase Transaction
Class of Stock [Line Items]
Treasury stock, shares acquired (shares)		1,179,138.4	1,200,000.0	1,200,000.0	1,200,000.0
Treasury stock acquired	$ 11.4