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Fair value measurements (Tables)
 12 Months Ended
Jul. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Recorded at Fair Value
Carrying amounts and the related estimated fair value of the Company’s long-term debt were as follows:
As of July 31,
20252024
(In millions)Carrying AmountFair ValueCarrying AmountFair Value
Unsecured Senior Notes$3,081 $3,033 $2,333 $2,263 
Private Placement Notes700 698 849 837