Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Sep. 30, 2010
CURRENT ASSETS:
Allowance for doubtful accounts	$ 400	$ 614
Value added tax receivable	$ 817	$ 880
STOCKHOLDERS' EQUITY:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	34,559,522	33,523,082
Common stock, shares outstanding	26,832,065	27,619,665
Treasury stock	7,727,457	5,903,417
Series A Preferred Stock [Member]
STOCKHOLDERS' EQUITY:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,800,000	1,800,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series B Preferred Stock [Member]
STOCKHOLDERS' EQUITY:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	200,000	200,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0