Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Sep. 30, 2018
Common Stock Class A Non-Voting
Stockholders’ equity:
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares issued	52,565,064	51,614,746
Common Stock, shares outstanding	52,565,064	51,614,746
Common Stock Class B Voting
Stockholders’ equity:
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	3,000,000	3,000,000
Common Stock, shares issued	2,970,171	2,970,171
Common Stock, shares outstanding	2,970,171	2,970,171