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STOCK BASED COMPENSATION - Management Equity Incentive Plan (MEIP) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Jan. 31, 2017
USD ($)
tranche
$ / shares
shares
Jan. 31, 2016
USD ($)
Oct. 31, 2016
shares
Jul. 26, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 4.0 $ 1.0    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units under the omnibus Plan (in shares) | shares 396,659   450,184  
Estimated fair value of MEIP RSU's (in USD per share) | $ / shares $ 25.61      
Stock-based compensation expense $ 1.3 0.0    
Compensation costs not yet recognized $ 5.5      
IPO | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price (in USD per share) | $ / shares       $ 21.00
Management Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of valuation tranches | tranche 5      
Stock-based compensation expense $ 2.3 1.0    
Management Equity Incentive Plan | Stock-based Compensation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares distributed to be held for MEIP participants (in shares) | shares       6,106,540
Management Equity Incentive Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 5 years      
Restricted share units under the omnibus Plan (in shares) | shares       3,388,481
Share price target (in USD per share) | $ / shares $ 48.47      
Estimated fair value of MEIP RSU's (in USD per share) | $ / shares $ 8.41      
Management Equity Incentive Plan | IPO | Stock-based Compensation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price (in USD per share) | $ / shares       $ 21.00
Management Equity Incentive Plan | Class B        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Threshold percentage of ownership of equity securities for exit event (less than) 20.00%      
Percentage of excess capital contributions received to trigger an Exit Event 250.00%      
Compensation costs not yet recognized $ 32.3      
Compensation costs not yet recognized, to be recognized before Exit Event $ 3.8      
Management Equity Incentive Plan | Class B | Stock-based Compensation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percent of service-based units 71.40%      
Vesting period 4 years      
Stock-based compensation expense $ 1.5 $ 1.0    
Compensation costs not yet recognized 10.5      
Management Equity Incentive Plan | Class B | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 0.2      
Management Equity Incentive Plan | Class C        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Class C, class D, and class E vesting thresholds 200.00%      
Management Equity Incentive Plan | Class D        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Class C, class D, and class E vesting thresholds 250.00%      
Management Equity Incentive Plan | Class E        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Class C, class D, and class E vesting thresholds 300.00%      
Management Equity Incentive Plan | Common Class C, Class D, Class E Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 0.6      
Compensation costs not yet recognized 10.2      
Management Equity Incentive Plan | Common Class C, Class D, Class E Stock | Stock-based Compensation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 9.0      
Management Equity Incentive Plan | Common Class C, Class D, Class E Stock | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1.5