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Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2018
Sep. 30, 2017
Common Stock Class A Non-Voting    
Stockholders’ equity:    
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common Stock authorized (shares) 100,000,000 100,000,000
Common Stock, shares issued (shares) 51,614,746 51,427,832
Common Stock, shares outstanding (shares) 51,614,746 51,427,832
Common Stock Class B Voting    
Stockholders’ equity:    
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common Stock authorized (shares) 3,000,000 3,000,000
Common Stock, shares issued (shares) 2,970,171 2,970,171
Common Stock, shares outstanding (shares) 2,970,171 2,970,171