STOCK-BASED COMPENSATION Valuation Assumptions (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility		30.70%	28.40%	33.50%
Risk-free interest rate		1.20%	1.40%	0.70%
Expected dividend yield		0.80%	1.40%	0.90%
Expected life (in years)		4 years 73 days	4 years 73 days	4 years 73 days
Weighted-average grant date fair value		$ 11.64	$ 9.21	$ 11.83
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	24.80%	24.90%	24.80%	24.90%
Risk-free interest rate	0.10%	0.10%	0.10%	0.10%
Expected dividend yield	1.30%	0.90%	1.30%	0.90%
Expected life (in years)	183 days	183 days	183 days	183 days
Weighted-average grant date fair value	$ 10.13	$ 9.58	$ 10.13	$ 9.58