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Income Taxes - Additional Information (Details)
$ in Millions
12 Months Ended
Oct. 31, 2016
USD ($)
state
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Income Taxes [Line Items]      
Tax benefit related to lapse of statute of limitations $ 20.8    
Interest on income taxes expense 0.6    
Work opportunity tax credit, new hires 6.7    
Work opportunity tax credit 5.1   $ 2.8
Benefit within income tax provision 2.2    
Tax benefit, deductions for energy efficient government buildings $ 1.2 $ 2.0  
Effective Income Tax Rate Reconciliation, Percent (20.00%) 25.30% 39.50%
State employment-based, tax credit   $ 1.6  
Re-measurement of certain tax benefits   1.6  
Unrecognized tax benefits that would impact effective tax rate $ 52.0 75.6 $ 78.6
Maximum decrease in unrecognized tax benefits that is reasonably possible 17.0    
Uncertain tax positions, interest and penalties accrued 2.3 3.2  
Unrecognized tax benefits, interest and penalties benefit $ 0.9    
Uncertain tax positions, interest and penalties recognized and expensed   $ 1.0 $ 0.9
Number of states in which entity operates | state 50    
State and Local Jurisdiction      
Income Taxes [Line Items]      
Operating loss carryforwards $ 8.7