Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011
Common Stock Class A Non-voting
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	54,000,000	54,000,000	54,000,000
Common stock, shares issued	48,223,698	47,228,610	46,971,535
Common stock, shares outstanding	48,223,698	47,228,610	46,971,535
Common Stock Class B Voting
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	3,000,000	3,000,000	3,000,000
Common stock, shares issued	2,970,171	2,970,171	2,970,171
Common stock, shares outstanding	2,970,171	2,970,171	2,970,171