Retirement and Post-Retirement Benefit Plans - Post-Retirement Benefit Plans (Narrative) (Details)	12 Months Ended
Oct. 31, 2025
Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Eligible age for HP retirement medical savings account plan	45 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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