TREASURY STOCK - Narrative (Details) - USD ($)	6 Months Ended		15 Months Ended	16 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jul. 13, 2015	Sep. 30, 2016	Mar. 31, 2016	May 19, 2015	Apr. 22, 2014
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period, value	$ 83,215,000	$ 184,995,000
Share Repurchase Program, April 2014
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount up to							$ 100,000,000
Shares repurchased during the period (in shares)		67,752	824,452
Shares repurchased during the period, value		$ 2,800,000	$ 34,300,000
Stock remaining to be purchased (in shares)					0
Share Repurchase Program, May 2015
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period (in shares)	3,029,391			13,107,527
Shares repurchased during the period, value	$ 76,600,000			$ 376,600,000
Stock remaining to be purchased (in shares)	6,892,473			6,892,473
Stock authorized to repurchase under stock repurchase program (in shares)						20,000,000
Restricted stock units
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period (in shares)	227,185
Shares repurchased during the period, value	$ 6,600,000