INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income before income taxes
Domestic	$ 22,188	$ 10,759	$ 54,138
Foreign	8,299	9,699	11,196
Income before taxes	30,487	20,458	65,334
Current
Federal	10,662	1,206	7,909
State	1,317	96	1,406
Foreign	1,203	2,382	2,455
Current income taxes	13,182	3,684	11,770
Deferred
Federal	(4,548)	2,613	9,785
State	(883)	255	2,215
Foreign	511	(196)	152
Deferred income taxes	(4,920)	2,672	12,152
Income tax expense	8,262	6,356	23,922
Difference between provision for income taxes and amount computed at the federal statutory rate
Provision at the federal statutory rate	10,706	7,160	22,866
Non-deductible expenses	768	971	1,309
Adjustment to unrecognized tax benefits	(1,838)	(1,732)	(2,069)
State income taxes, net of federal income tax effect	1,186	1,515	3,365
Foreign income taxed at other rates	(1,262)	(1,214)	(1,383)
Benefit of domestic production deduction	(1,105)	(64)	(525)
Other	(193)	(280)	359
Income tax expense	8,262	6,356	23,922
Current income tax receivable	4,600	4,749
U.S. taxes and foreign withholding taxes payable on distribution of aggregate unremitted earnings	5,783
Aggregate unremitted earnings of foreign subsidiaries	41,547
Deferred income tax assets
Goodwill and intangibles	18,234	21,096
Litigation reserve	92	78
Compensation and benefit accruals	5,449	5,383
Stock based compensation	7,754	6,892
Other liabilities	3,140	2,932
Net operating losses and credits	4,470	3,625
Accounts receivable and inventories	370	452
Pension Reserve	10,683	6,789
Total deferred income tax assets	50,192	47,247
Valuation allowance	(3,424)	(2,538)
Net deferred income tax assets	46,768	44,709
Deferred income tax liabilities
Property and equipment	75,881	79,166
Prepaid expenses	2,861	2,696
Other	589	346
Total deferred income tax liabilities	79,331	82,208
Unrecognized tax benefits
Unrecognized tax benefits that, if recognized, would decrease the effective income tax rate	10,544
Decrease in reserve for unrecognized tax benefits	1,135
Net decrease in tax expense due to a portion of change in reserve	2,734
Increase in interest expense related to income tax uncertainties	264
Accrued interest and penalties related to income tax uncertainties	1,562	1,826
Unrecognized tax benefit activity
Unrecognized tax benefit at beginning of year	12,290	13,819
Decreases for tax positions in prior periods	(68)	(202)
Additions for tax positions in current periods	2,164	1,539
Lapse of statute of limitations	(3,231)	(2,866)
Unrecognized tax benefit at end of year	$ 11,155	$ 12,290	$ 13,819