Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowances for accounts receivable	$ 3,875	$ 3,872
Discounts on total debt	$ 22,278	$ 23,243
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	180,000,000	180,000,000
Common stock, shares issued	76,406,697	75,588,396
Common stock, shares outstanding	76,406,697	75,588,396