STOCK-BASED COMPENSATION Valuation Assumptions (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	30.70%	43.50%	33.50%	42.20%
Risk-free interest rate	1.20%	0.50%	0.70%	0.60%
Expected dividends	0.80%	1.30%	0.90%	1.30%
Expected life (in years)	4 years 73 days	4 years 110 days	4 years 73 days	4 years 110 days
Weighted-average grant date fair value	$ 11.64	$ 10.84	$ 11.83	$ 10.43
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			24.90%	38.40%
Risk-free interest rate			0.10%	0.10%
Expected dividends			0.90%	1.10%
Expected life (in years)			183 days	183 days
Weighted-average grant date fair value			$ 9.58	$ 8.95