INCOME TAXES (Details) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Tax Disclosure [Abstract]
Effective tax rate	23.50%	22.30%	24.10%
Permanently reinvested foreign earnings	$ 491,000,000
Unrecognized tax benefits	11,100,000	10,500,000	11,200,000
Accrued interest related to unrecognized tax benefits	1,700,000	1,700,000
Accrued penalties	0	0
Current:
Federal	23,844,000	22,601,000	17,761,000
State	2,719,000	1,077,000	2,290,000
Foreign	5,080,000	5,888,000	7,241,000
Total current provision for income taxes	31,643,000	29,566,000	27,292,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	2,324,000	475,000	(2,841,000)
State	(569,000)	1,262,000	(199,000)
Foreign	168,000	110,000	35,000
Deferred Income Taxes Expense Benefit	1,923,000	1,847,000	(3,005,000)
Income tax expense from continuing operations	33,566,000	31,413,000	24,287,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
United States	79,589,000	75,426,000	51,392,000
Foreign	63,013,000	65,230,000	49,348,000
Income from continuing operations before income taxes	142,602,000	140,656,000	100,740,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax expense at statutory rate	49,911,000	49,229,000	35,259,000
Foreign operations taxed at different rates	(16,973,000)	(16,308,000)	(11,166,000)
State taxes, net of federal benefit	2,149,000	2,340,000	2,091,000
Research and development credit	(1,392,000)	(3,234,000)	(1,383,000)
Other, net	(129,000)	(614,000)	(514,000)
Income tax expense from continuing operations	33,566,000	31,413,000	24,287,000
Components of Deferred Tax Assets [Abstract]
Accruals and other reserves	9,822,000	9,850,000
Net operating loss carry forward	6,317,000	5,095,000
Stock compensation	1,388,000	5,519,000
Other deferred tax assets	3,561,000	4,417,000
Valuation allowance	(6,088,000)	(5,274,000)
Total deferred tax assets	15,000,000	19,607,000
Components of Deferred Tax Liabilities [Abstract]
Deferred gains on sales of properties	(1,881,000)	(1,954,000)
Purchased intangibles	(143,000)	(323,000)
Unremitted earnings of certain subsidiaries	(3,064,000)	(3,064,000)
Fixed asset depreciation	(5,309,000)	(4,244,000)
Other deferred tax liabilities	(2,186,000)	(2,199,000)
Total deferred tax liabilities	(12,583,000)	(11,784,000)
Net deferred tax assets	2,417,000	7,823,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	10,458,000	11,201,000	11,090,000
Increase (decrease) of unrecognized tax benefits related to prior years	116,000	(960,000)	100,000
Increase of unrecognized tax benefits related to the current year	2,074,000	2,185,000	2,016,000
Reductions to unrecognized tax benefits related to lapse of applicable statute of limitations	(1,507,000)	(1,968,000)	(2,005,000)
Balance at end of period	$ 11,141,000	$ 10,458,000	$ 11,201,000