STOCK-BASED COMPENSATION Valuation Assumptions (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2011 years	Dec. 31, 2010 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	48.10%	45.30%	45.60%	45.90%
Risk-free interest rate	0.60%	0.90%	1.10%	1.40%
Expected dividends	0.60%	0.60%	0.60%	0.60%
Expected life (in years)	4	4.2	4	4.2
Weighted-average grant date fair value	$ 11.86	$ 12.88	$ 12.08	$ 11.86
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			38.70%	41.80%
Risk-free interest rate			0.10%	0.20%
Expected dividends			0.60%	0.70%
Expected life (in years)			0.5	0.5
Weighted-average grant date fair value			$ 8	$ 8.02