Note 12 - Senior Notes and Credit Facilities - Senior Notes and Credit Facilities Balances (Details) - USD ($) $ in Thousands		Jan. 31, 2020	Oct. 31, 2019
Net discounts and premiums		$ (23,503)	$ 49,145
Net debt issuance costs		(24,552)	(19,970)
Total Senior Notes and Credit Facilities, net of discount, premium and debt issuance costs		1,460,200	1,479,990
Senior Secured Notes [Member]
Long-term Debt, Gross		1,159,490	1,165,848
Senior Secured Notes [Member] | The 10.0% 2022 Notes [Member]
Long-term Debt, Gross		195,842	218,994
Senior Secured Notes [Member] | The 10.5% 2024 Notes [Member]
Long-term Debt, Gross		69,683	211,391
Senior Secured Notes [Member] | The 7.75% Senior Secured 1.125 Lien Notes due February 15, 2026 [Member]
Long-term Debt, Gross		350,000	350,000
Senior Secured Notes [Member] | The 10.5% Senior Secured 1.25 Lien Notes due February 15, 2026 [Member]
Long-term Debt, Gross		282,322	282,322
Senior Secured Notes [Member] | The 11.25% Senior Secured 1.5 Lien Notes due February 15, 2026 [Member]
Long-term Debt, Gross		103,141	103,141
Senior Secured Notes [Member] | The 10.0% Senior Secured 1.75 Lien Notes due 2025 [Member]
Long-term Debt, Gross		158,502
Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]
Long-term Debt, Gross		180,710	180,710
Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] | The 8.0% Senior Notes Due 2027 [Member]
Long-term Debt, Gross	[1]
Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] | The 13.5% Senior Notes Due 2026 [Member]
Long-term Debt, Gross		90,590	90,590
Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] | The 5.0% Senior Notes due 2040 [Member]
Long-term Debt, Gross		90,120	90,120
Senior Unsecured Term Loan Credit Facility Due 2027 [Member]
Long-term Debt, Gross		39,551	202,547
Senior Secured Term Loan [Member] | The 10.0% Senior Secured 1.75 Lien Term Loans Due 2028 [Member]
Long-term Debt, Gross		81,498
Senior Secured Revolving Credit Facility [Member]
Long-term Debt, Gross	[2]

[1] $26.0 million of 8.0% Senior 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. On November 1, 2019, the maturity of the 8.0% Senior Notes was extended to November 1, 2027.

[2] At January 31, 2020, provides for up to $125.0 million in aggregate amount of senior secured first lien revolving loans. Availability thereunder will terminate on December 28, 2022.