Quarterly report pursuant to Section 13 or 15(d)

Contingencies (Details)

v3.19.1
Contingencies (Details)
$ in Millions
6 Months Ended
Feb. 05, 2019
USD ($)
Jan. 31, 2019
Contingencies (Details) [Line Items]    
Number Of Pending Cases   7
Roche [Member] | Subsequent Event [Member]    
Contingencies (Details) [Line Items]    
Litigation Settlement, Amount Awarded from Other Party $ 21