STOCK-BASED COMPENSATION Valuation Assumptions (Details) (USD $)	3 Months Ended
Jun. 30, 2011 years	Jun. 30, 2010 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	44.40%	46.10%
Risk-free interest rate	1.40%	1.90%
Expected dividends	0.60%	0.70%
Expected life (in years)	4	4.2
Weighted-average grant date fair value	$ 12.58	$ 11.26

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References+ Details

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References+ Details