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Consolidated Balance Sheets (Parentheticals) - USD ($)
Sep. 29, 2019
Sep. 30, 2018
Accounts receivable, allowance for doubtful accounts $ 6,434,000 $ 4,806,000
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authoritzed (in shares) 500,000 500,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01  
Common Class A [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 120,000,000 120,000,000
Common stock, shares issued (in shares) 57,646,000 57,141,000
Common stock, shares outstanding (in shares) 57,646,000 57,141,000
Common Class B [Member]    
Common stock, par value (in dollars per share) $ 2 $ 2
Common stock, shares authorized (in shares) 30,000 30,000
Common stock, shares issued (in shares) 0 0