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Segment Information (Detail)
$ in Billions
3 Months Ended 12 Months Ended
Jul. 31, 2016
Oct. 31, 2016
USD ($)
segment
Oct. 31, 2015
USD ($)
May 31, 2016
Segment Reporting Information        
Number of reportable segments | segment   5    
Advance royalty proceeds received from intercompany advanced royalty payments and licensing arrangements | $   $ 3.7 $ 5.0  
Royalty recognition term   5 years    
Entity ownership of existing businesses percentage 49.00%      
Unisplendour | H3C        
Segment Reporting Information        
Ownership       51.00%