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
Mar. 31, 2018
Sep. 30, 2017
Mar. 25, 2017
Accounts receivable allowance for doubtful accounts $ 20,976 $ 21,436 $ 20,227
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 12,176,787
Class A Common Stock      
Common stock, shares outstanding (in shares) 38,171,595 38,019,736 37,731,149
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