CAPITAL STOCK (Schedule of Summary of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 Y
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, (shares), Beginning Balance	2,446,843
Weighted Average Exercise Price per Share, Beginning Balance	$ 48.94
Weighted Average Remaining Life (years), Beginning Balance	4.09
Aggregate Intrinsic Value, Beginning Balance	$ 43,149
Options Outstanding, (shares), Granted	464,837
Weighted Average Exercise Price per Share, Granted	$ 62.29
Options Outstanding, (shares), Exercised	(369,092)
Weighted Average Exercise Price per Share, Exercised	$ 42.00
Options Outstanding, (shares), Forfeited	(119,021)
Weighted Average Exercise Price per Share, Forfeited	$ 54.16
Options Outstanding, (shares), Ending Balance	2,423,567
Weighted Average Exercise Price per Share, Ending Balance	$ 52.30
Weighted Average Remaining Life (years), Ending Balance	3.87
Aggregate Intrinsic Value, Ending Balance	42,134
Options Outstanding, (shares), Exercisable and End of Period	1,412,052
Weighted Average Exercise Price per Share, Exercisable at End of Period	$ 47.98
Weighted Average Remaining Life (years), Exercisable at End of Period	2.57
Aggregate Intrinsic Value, Exercisable at End of Period	30,644
Options Outstanding, (shares), Vested and Expected to Vest at End of Period	2,302,589
Weighted Average Exercise Price per Share, Vested or Expected to Vest at End of Period	$ 51.95
Weighted Average Remaining Life (years), Vested or Expected to Vest at End of Period	3.76
Aggregate Intrinsic Value, Vested and Expected to Vest at End of Period	$ 40,816