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Consolidated Statement of Shareholders' Equity and Contingently Redeemable Common Stock - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock, Common [Member]
Common Class A [Member]
Common Class B [Member]
Contingently Redeemable Common Stock [Member]
Balance at Oct. 31, 2015 $ 224.6   $ 204.6 $ 24.6   $ (4.6)      
Balance, shares at Oct. 31, 2015             7,786,960 42,684,320  
Temporary equity balance at Oct. 31, 2015                 $ 15.4
Temporary equity balance, shares at Oct. 31, 2015                 2,064,240
Net income 30.2     30.2          
Other comprehensive loss, net of tax 0.1                
Stock-based compensation expense 1.4   1.4            
Redemption of common shares (11.4)   (0.7)     (10.7)      
Redemption of common shares, shares             (1,312,720)    
Retirement of treasury stock     (2.9) (12.4)   $ 15.3      
Change in value of contingently redeemable common stock (10.7)     (10.7)          
Reclassification of contingently redeemable common stock 3.8   3.8            
Reclassification of contingently redeemable common stock, shares             456,480   (456,480)
Change in value of contingently redeemable common stock                 $ 10.7
Reclassification of contingently redeemable common stock                 (3.8)
Balance at Oct. 29, 2016 237.9   206.2 31.7          
Balance, shares at Oct. 29, 2016             6,930,720 42,684,320  
Temporary equity balance at Oct. 29, 2016                 $ 22.3
Temporary equity balance, shares at Oct. 29, 2016                 1,607,760
Net income 31.4     31.4          
Stock-based compensation expense 5.3   5.3            
Excess tax benefits from stock-based compensation expense 2.5   2.5            
Change in value of contingently redeemable common stock (13.1)     (13.1)          
Reclassification of contingently redeemable common stock 35.3   35.3            
Reclassification of contingently redeemable common stock, shares             1,607,760   (1,607,760)
Change in value of contingently redeemable common stock                 $ 13.1
Reclassification of contingently redeemable common stock                 $ (35.4)
Reclassification of liability awards 26.5   26.5            
Net proceeds from initial public offering 253.6   253.6            
Net proceeds from initial public offering, shares   12,500,000              
Reclassification of shares of common stock 0.1 $ 0.1              
Reclassification of shares of common stock, shares   51,222,800         (8,538,480) (42,684,320)  
Exercise of common stock options 2.6   2.6            
Exercise of common stock options, shares   423,150              
Dividends declared on common stock (9.6)     (9.6)          
Rounding of partial shares held prior to stock split   (5)              
Balance at Oct. 31, 2017 572.5 $ 0.1 532.0 40.4          
Balance, shares at Oct. 31, 2017   64,145,945              
Net income 13.0     13.0          
Other comprehensive loss, net of tax (1.4)       $ (1.4)        
Stock-based compensation expense 3.8   3.8            
Exercise of common stock options $ 9.7   9.7            
Exercise of common stock options, shares 1,757,984 1,757,984              
Vesting of restricted stock, net of employee tax withholding $ (0.1)   (0.1)            
Vesting of restricted stock, net of employee tax withholding, Shares   13,231              
Dividends declared on common stock (12.8)     (12.8)          
Repurchase and retirement of common stock (53.3) $ (53.3) (53.3)            
Repurchase and retirement of common stock, Shares   (3,233,352)              
Balance at Oct. 31, 2018 $ 531.4 $ 0.1 $ 492.1 $ 40.6 $ (1.4)        
Balance, shares at Oct. 31, 2018   62,683,808