Taxes on Earnings - Schedule of Differences Between U.S. Federal Statutory Income Tax Rate and HP's Effective Tax Rate (Details)	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal statutory income tax rate from continuing operations	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	2.40%	2.20%	1.70%
Impact of foreign earnings including GILTI and FDII, net	(2.90%)	(1.00%)	(1.10%)
Research and development (“R&D”) credit	(2.30%)	(1.10%)	(1.00%)
Valuation allowances	(2.50%)	(7.10%)	(7.30%)
Uncertain tax positions and audit settlements	(10.20%)	1.00%	2.40%
Changes in tax laws or rates enacted	1.40%	0.30%	(0.30%)
Impact of internal reorganization	0.00%	0.00%	(27.40%)
Other, net	(1.70%)	0.10%	0.90%
Effective tax rate	5.20%	15.40%	(11.10%)