TREASURY STOCK - Narrative (Details) - USD ($)	4 Months Ended	6 Months Ended		17 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	May. 19, 2015	Apr. 22, 2014
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period, value		$ 184,995,000	$ 30,894,000
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
Restricted stock units
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period (in shares)		157,771
Shares repurchased during the period, value		$ 5,900,000
Share Repurchase Program, May 2015
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period (in shares)	4,496,596
Shares repurchased during the period, value	$ 176,300,000
Remaining stock authorized to repurchase under stock repurchase program	$ 15,503,404	$ 15,503,404		$ 15,503,404
Stock authorized to repurchase under stock repurchase program (in shares)					20,000,000