Taxes on Earnings - Summary of Differences Between the U.S. Federal Statutory Income Tax Rate and Effective Tax Rate (Details)	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2022
Differences between the U.S. federal statutory income tax rate and HP's effective tax rate
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	0.40%	0.90%	2.80%
Lower rates in other jurisdictions, net	(1.30%)	(4.40%)	(0.90%)
Valuation allowance	(1.30%)	(2.80%)	(31.50%)
U.S. permanent differences	(4.00%)	(1.50%)	6.00%
U.S. R&D credit	(1.80%)	(2.10%)	(5.10%)
Uncertain tax positions	(0.30%)	(2.00%)	(15.60%)
Goodwill impairment	0.00%	0.00%	21.50%
Other, net	0.00%	0.10%	2.70%
Effective tax rate (as a percent)	12.70%	9.20%	0.90%