Regulatory Matters - Cost Recovery Mechanisms (Details)																			9 Months Ended
	Jul. 31, 2025 USD ($)	Jun. 01, 2025 USD ($)	May 01, 2025 $ / kWh	Nov. 27, 2024 $ / kWh	Jul. 31, 2024 USD ($)	Jun. 01, 2024 USD ($) MW	May 01, 2024 $ / kWh	Nov. 30, 2023 USD ($) $ / kWh	Oct. 11, 2023	Jul. 31, 2023 USD ($)	Jul. 01, 2023 USD ($) $ / KWH_Kilowatt_hour	Jun. 01, 2023 USD ($)	May 01, 2023 $ / kWh	Feb. 23, 2023 $ / kWh	Feb. 01, 2023 $ / kWh	Jul. 12, 2022 $ / kWh	Feb. 01, 2022 $ / kWh	Oct. 01, 2021 $ / kWh	Sep. 30, 2025 USD ($) $ / kWh	Aug. 31, 2025 USD ($)	Jul. 01, 2025 USD ($)	Apr. 22, 2025 USD ($)	Jul. 01, 2024 USD ($)	Apr. 26, 2024 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2023 USD ($)	Nov. 30, 2022 USD ($)	Jul. 01, 2022 USD ($)
APS | Damage from Fire, Explosion or Other Hazard
Public Utilities, General Disclosures [Line Items]
Past due balance threshold qualifying for payment extension																			$ 75
Arizona Renewable Energy Standard and Tariff | ACC | APS
Public Utilities, General Disclosures [Line Items]
Plan term																			5 years
Arizona Renewable Energy Standard and Tariff 2018 | ACC | APS
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																					$ 110,100,000		$ 92,700,000		$ 95,100,000			$ 86,200,000
2023 Transportation Electrification Plan | ACC | APS
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																											$ 5,000,000
Demand Side Management Adjustor Charge 2023 | ACC | APS
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																										$ 88,000,000	$ 88,000,000
Demand Side Management Adjustor Charge 2024 | ACC | APS
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget								$ 91,500,000
Rate matter, updated budget																								$ 90,900,000
Approved rate, amount of customer refunds	$ 7,600,000																					$ 9,000,000
Renewable Energy Adjustment Charge | ACC | APS
Public Utilities, General Disclosures [Line Items]
Approved rate, amount of customer refunds																				$ 44,200,000		$ 43,000,000
Power Supply Adjustor (PSA) | ACC | APS
Public Utilities, General Disclosures [Line Items]
PSA rate (in dollars per kWh) | $ / kWh				0.013977				0.019074						0.019074	0.006		0.007544
Forward component of PSA rate1 (in dollars per kWh) | $ / kWh				(0.000281)				(0.012624)						(0.005527)			0.004842
Historical component of PSA rate1 (in dollars per kWh) | $ / kWh				0.008728				0.013071						0.013071			0.012386
Reporting threshold of balancing account								$ 100,000,000
Overall approved PSA rate1 (in dollars per kWh) | $ / kWh								0.011977
Transition component of PSA rate | $ / kWh				0.005530				0.011530
Power Supply Adjustor (PSA) | ACC | APS | Cost Recovery Mechanisms
Public Utilities, General Disclosures [Line Items]
Maximum increase decrease in PSA rate (in dollars per kWh) | $ / kWh				0.006															0.006
PSA rate In prior years1 (in dollars per kWh) | $ / kWh				0.002													0.004
Transmission rates, transmission cost adjustor and other transmission matters | FERC | APS
Public Utilities, General Disclosures [Line Items]
Rate matters, increase (decrease) In cost recovery		$ 119,000,000				$ 27,400,000						$ 34,700,000
Rate matters, increase (decrease) in cost recovery, wholesale customer rates		4,600,000				16,600,000						20,700,000
Rate matters, increase (decrease) in cost recovery, retail customer rates		114,400,000				10,800,000						14,000,000
Rate matters, increase (decrease) In retail revenue requirements		$ 88,300,000				$ 8,800,000						$ (10,000,000)
Rate matters, increase in residential and commercial rates (in MW) | MW						3
Rate matters, decrease in commercial rates (in MW) | MW						3
Lost Fixed Cost Recovery Mechanism | APS
Public Utilities, General Disclosures [Line Items]
Rate matter cap percentage of retail revenue																			1.00%
Amount of adjustment approved representing prorated sales losses pending approval	60,100,000				$ 49,600,000					$ 68,700,000
Amount of adjustment representing annual recovery	$ 10,500,000				$ 8,000,000					9,600,000
Lost Fixed Cost Recovery Mechanism | ACC
Public Utilities, General Disclosures [Line Items]
Amount of adjustment approved to transfer										$ 27,100,000
Court Resolution Surcharge | ACC | APS
Public Utilities, General Disclosures [Line Items]
Court resolution surcharge (in dollars per kWh) | $ / KWH_Kilowatt_hour											0.00175
Lost revenue recovery											$ 59,600,000
Lost revenue recovery collected																			$ 39,400,000
Net Metering | ACC | APS
Public Utilities, General Disclosures [Line Items]
Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease			10.00%				10.00%		10.00%				10.00%			10.00%			10.00%
Rate matter, request second-year energy price for exported energy (in dollars per kwh) | $ / kWh																0.0846		0.094
Third-year export energy price (in dollars per kWh) | $ / kWh			0.06171				0.06857						0.07619
Rate lock period									10 years