Long-Term Debt (Schedule Of Long-Term Debt Maturities) (Details) (Alaska Electric Light & Power [Member], Capital Lease Obligations [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Alaska Electric Light & Power [Member] | Capital Lease Obligations [Member]
Capital Leases Future Minimum Payments of Principal Remainder Of Fiscal Year	$ 526
Capital Leases Future Minimum Payments of Principal in Year Two	2,230
Capital Leases Future Minimum Payments of Principal in Year Three	2,350
Capital Leases Future Minimum Payments of Principal in Year Four	2,480
Capital Leases Future Minimum Payments of Principal in Year Five	2,615
Capital Leases Future Minimum Payments of Principal Thereafter	60,280
Capital Lease Obligations	70,481
Capital Leases Future Minimum Payments of Interest Remainder Of Fiscal Year	954
Capital Leases Future Minimum Payments of Interest Due in Two Years	3,690
Capital Leases Future Minimum Payments of Interest Due in Three Years	3,567
Capital Leases Future Minimum Payments of Interest Due in Four Years	3,438
Capital Leases Future Minimum Payments of Interest Due in Five Years	3,305
Capital Leases Future Minimum Payments of Interest Due Thereafter	28,529
Capital Leases Future Minimum Payments of Interest Due	43,483
Capital Leases Future Minimum Payments Remainder Of Fiscal Year	1,480
Capital Leases, Future Minimum Payments Due in Two Years	5,920
Capital Leases, Future Minimum Payments Due in Three Years	5,917
Capital Leases, Future Minimum Payments Due in Four Years	5,918
Capital Leases, Future Minimum Payments Due in Five Years	5,920
Capital Leases, Future Minimum Payments Due Thereafter	88,809
Capital Leases, Future Minimum Payments Due	$ 113,964