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Description of Business and Summary of Significant Accounting Policies (Details Textual)
$ in Millions
 6 Months Ended
Mar. 23, 2017
Jan. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Description Of Business and Summary Of Significant Accounting Policies [Line Items]      
Stockholders' Equity Note, Stock Split two-for-one    
Noncontrolling Interest, Ownership Percentage by Parent   59.50%  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   40.50%  
Abnormal Costs   $ 62.4  
Tax benefits realized upon ultimate settlement, Description   The second step is to measure the tax position as the largest amount that is more than 50% likely to be realized upon ultimate settlement.  
Capitalized software costs   $ 28.1 $ 38.5
Accumulated amortization expense   14.9 $ 25.7
Capitalized Computer Software, Period Increase (Decrease)   $ 13.9  
Number of operating segments   2  
Number of reportable segment   2