INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income (loss) from continuing operations before income taxes [Abstract]
Domestic									$ 55,555	$ 54,886	$ 39,835
Foreign									7,316	24,026	33,442
Total	18,835	19,829	8,855	15,352	15,978	19,348	20,102	23,484	62,871	78,912	73,277
U.S. federal and state [Abstract]
Current									19,975	15,700	15,372
Deferred									(308)	6,194	(2,643)
Total									19,667	21,894	12,729
Foreign [Abstract]
Current									5,593	6,616	10,597
Deferred									(3,215)	(1,260)	493
Total									2,378	5,356	11,090
Total U.S. and foreign	7,196	6,587	3,325	4,937	6,689	6,559	7,010	6,992	22,045	27,250	23,819
Effective income tax rate reconciliation [Abstract]
Federal statutory rate (in hundredths)									35.00%	35.00%	35.00%
U.S. benefits from research and experimentation activities (in hundredths)									(0.50%)	(2.00%)	(0.60%)
State taxes, net of federal effect (in hundredths)									0.20%	0.60%	0.50%
Foreign income at other than U.S. rates (in hundredths)									(1.90%)	(2.80%)	(2.70%)
Non deductible expense executive compensation (in hundredths)									0.80%	1.40%	0.00%
Tax-exempt interest income (in hundredths)									0.00%	(0.10%)	(0.10%)
Share-based compensation (in hundredths)									0.70%	3.30%	0.30%
Adjustment of prior amounts, net of valuation allowance									0.90%	0.00%	0.00%
Domestic production deduction (in hundredths)									(0.50%)	(0.80%)	(0.10%)
Other, net (in hundredths)									0.40%	(0.10%)	0.20%
Provision for income taxes (in hundredths)									35.10%	34.50%	32.50%
Deferred Tax Liability Not Recognized [Line Items]
Undistributed earnings of foreign subsidiaries	31,100								31,100
Adjustments to correct prior period tax expense amounts									973	671
Reversal of deferred tax asset related to certain share-based compensation expense							497
Reconciliation of gross unrecognized tax benefits [Roll Forward]
Beginning balance				603				173	603	173	249
Additions for tax positions relating to the current fiscal year									51	123	0
Additions for tax positions relating to prior fiscal years									114	307	153
Settlements with taxing authorities									(353)	0	(28)
Lapse of statute of limitations									(132)	0	(201)
Ending balance	283				603				283	603	173
Accrued interest and penalties on uncertain tax positions	4				19				4	19
Deferred tax assets [Abstract]
Employee benefits	4,035				3,246				4,035	3,246
Inventory	2,930				2,886				2,930	2,886
Bad debt reserve	1,708				387				1,708	387
Share-based compensation expense	12,659				12,184				12,659	12,184
Operating Loss Carryforwards, amount	2,292				768				2,292	768
Other	2,656				1,558				2,656	1,558
Valuation allowance	(1,378)				0				(1,378)	0
Total deferred tax assets	24,902				21,029				24,902	21,029
Deferred tax liabilities [Abstract]
Translation adjustment	7,966				10,576				7,966	10,576
Depreciation and amortization	3,776				1,568				3,776	1,568
Unremitted foreign earnings	1,810				3,647				1,810	3,647
Other	645				127				645	127
Total deferred tax liabilities	14,197				15,918				14,197	15,918
Carryforwards [Line Items]
Operating Loss Carryforwards, Valuation Allowance	1,699								1,699
Operating loss carryforwards expiration dates									fiscal year 2017 through fiscal year 2030
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Tax periods open to examination by taxing authorities (years)	fiscal years 2009 through 2011								fiscal years 2009 through 2011
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Tax periods open to examination by taxing authorities (years)	fiscal years 2008 through 2011								fiscal years 2008 through 2011
Carryforwards [Line Items]
Gross operating loss carryforward amounts	1,528								1,528
Tax Credit Carryforward, Amount	1,818								1,818
Tax Credit Carryforward, Valuation Allowance	1,047								1,047
Foreign Country [Member]
Income Tax Examination [Line Items]
Tax periods open to examination by taxing authorities (years)	fiscal years 2008 through 2011								fiscal years 2008 through 2011
Carryforwards [Line Items]
Gross operating loss carryforward amounts	$ 7,772								$ 7,772