STOCKHOLDERS' EQUITY (Details 3) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock Option and Other Compensation Plans
Number of shares authorized under the plans	3,480,000
Number of Shares
Options granted (in shares)	0	0
Minimum
Stock Option and Other Compensation Plans
Vesting period for awards granted under the plans	1 year
Maximum
Stock Option and Other Compensation Plans
Vesting period for awards granted under the plans	3 years
Stock options
Stock Option and Other Compensation Plans
Term of awards from the date of grant	10 years
Number of Shares
Options outstanding, beginning of year (in shares)	376,331	472,446	613,934
Options granted (in shares)			56,181
Options exercised (in shares)	(50,505)	(75,714)	(197,669)
Options canceled or expired (in shares)	(10,664)	(20,401)
Options outstanding, end of year (in shares)	315,162	376,331	472,446
Options exercisable, end of year (in shares)	312,895	370,400	397,592
Options available for grant (in shares)	284,000	292,000	301,732
Weighted Average Exercise Price
Options outstanding, beginning of year (in dollars per share)	$ 55.10	$ 55.77	$ 47.37
Options granted (in dollars per share)			$ 74.87
Options exercised (in dollars per share)	$ 42.75	$ 56.63	$ 35.12
Options canceled or expired (in dollars per share)	$ 65.72	$ 65.01
Options outstanding, end of year (in dollars per share)	$ 56.72	$ 55.10	$ 55.77
Options exercisable, end of year (in dollars per share)	$ 56.68	$ 55.00	$ 53.06
Weighted average fair value per share of options granted during the year (in dollars per share)			$ 26.21