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General Accounting Pronouncements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 31, 2017
Jul. 31, 2017
Nov. 01, 2016
Accounting Standards Update 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Excess tax benefit, amount   $ 13.4  
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment     $ 17.9
Rebate Accruals [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative Effect on Retained Earnings, Net of Tax $ (4.1)    
Cumulative effect on retained earnings, net of tax $ (4.1)