CAPITAL STOCK (Schedule of Summary of Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
	Mar. 31, 2012
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Shares, Beginning Balance	130,632
Weighted Average Grant Date Fair Value, Beginning Balance	$ 50.62
Shares, Awarded	90,228
Weighted Average Market Value at Grant Date, Awarded	$ 59.81
Shares, Released	(45,064)
Weighted Average Market Value at Grant Date, Released	$ 61.45
Shares, Forfeited	(15,033)
Weighted Average Market Value at Grant Date, Forfeited	$ 53.48
Shares, Ending Balance	160,763
Weighted Average Grant Date Fair Value, Ending Balance	$ 51.72