CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Current assets
Allowance for doubtful accounts	$ 4,757	$ 1,090
Stockholders' equity
Common stock: Authorized	200,000,000	200,000,000
Common stock: par value	$ 0.0010	$ 0.0010
Common stock: Issued	28,864,527	27,652,336
Treasury stock at cost, shares	5,682,288	4,715,577