Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Allowance for doubtful accounts receivable	$ 1,360	$ 1,507
Common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	195,000	195,000
Common stock, shares, issued	55,110	55,058
Common stock, shares, outstanding	55,110	55,058