Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Jun. 24, 2017
Accounts receivable allowance for doubtful accounts $ 22,021 $ 21,436 $ 21,277
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common Stock      
Common stock, shares outstanding (in shares) 12,145,135 12,160,023 12,160,023
Class A Common Stock      
Common stock, shares outstanding (in shares) 38,373,324 38,019,736 37,933,970
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Class B Common Stock      
Common stock, shares outstanding (in shares) 1,652,262 1,652,262 1,652,262
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01