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Litigation (Details)
claim in Thousands, $ in Millions
6 Months Ended 12 Months Ended
Jan. 31, 2021
USD ($)
claim
Jul. 31, 2020
USD ($)
Commitments and Contingencies Disclosure [Abstract]    
Number of pending claims | claim 125  
Arbitration fees $ 10 $ 14
Refund For Reduction In Claim Processing Fees $ 6