Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2011	Sep. 30, 2010	Jun. 30, 2010
Common Class A Non-voting
Stockholders' equity:
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	46,971,535	46,256,051	46,247,951
Common Stock, shares outstanding	46,971,535	46,256,051	46,247,951
Common Class B Voting
Stockholders' equity:
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