Note 12 - Senior Notes and Credit Facilities - Senior Notes and Credit Facilities Balances (Details) (Parentheticals)		3 Months Ended	12 Months Ended
		Jan. 31, 2022	Oct. 31, 2021
Senior Unsecured Term Loan Credit Facility Due 2027 [Member]
Debt Instrument, Maturity Date		Feb. 01, 2027	Feb. 01, 2027
The 10.0% Senior Secured 1.75 Lien Notes due 2025 [Member] | Senior Secured Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		10.00%	10.00%
Debt Instrument, Maturity Date		Nov. 15, 2025	Nov. 15, 2025
The 7.75% Senior Secured 1.125 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		7.75%	7.75%
Debt Instrument, Maturity Date		Feb. 15, 2026	Feb. 15, 2026
The 10.5% Senior Secured 1.25 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		10.50%	10.50%
Debt Instrument, Maturity Date		Feb. 15, 2026	Feb. 15, 2026
The 11.25% Senior Secured 1.5 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		11.25%	11.25%
Debt Instrument, Maturity Date		Feb. 15, 2026	Feb. 15, 2026
The 8.0% Senior Notes Due 2027 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	[1]	8.00%	8.00%
Debt Instrument, Maturity Date	[1]	Nov. 01, 2027	Nov. 01, 2027
The 13.5% Senior Notes Due 2026 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		13.50%	13.50%
Debt Instrument, Maturity Date		Feb. 01, 2026	Feb. 01, 2026
The 5.0% Senior Notes due 2040 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		5.00%	5.00%
Debt Instrument, Maturity Date		Feb. 01, 2040	Feb. 01, 2040
The 10.0% Senior Secured 1.75 Lien Term Loans Due 2028 [Member] | Senior Secured Term Loan [Member]
Debt Instrument, Maturity Date		Jan. 31, 2028	Jan. 31, 2028

[1] $26.0 million of 8.0% Senior Notes due 2027 (the "8.0% 2027 Notes") are owned by a wholly-owned consolidated subsidiary of HEI. Therefore, in accordance with GAAP, such notes are not reflected on the Condensed Consolidated Balance Sheets of HEI.