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Fair value measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Additional Information) (Detail)
6 Months Ended
Apr. 30, 2023
Fair Value Disclosures [Abstract]  
Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum 100.00%
Executive officers share-based long-term incentive compensation deferrals percentage, maximum 90.00%