Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Deferred Share Units [Member] Common Stock [Member]	Deferred Share Units [Member] Additional Paid-in Capital [Member]	Deferred Share Units [Member] Retained Earnings [Member]	Deferred Share Units [Member] AOCI Attributable to Parent [Member]	Deferred Share Units [Member]	Performance Share Units [Member] Common Stock [Member]	Performance Share Units [Member] Additional Paid-in Capital [Member]	Performance Share Units [Member] Retained Earnings [Member]	Performance Share Units [Member] AOCI Attributable to Parent [Member]		Performance Share Units [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]		Total
Balance (in shares) at Nov. 30, 2017																	322,219
Balance at Nov. 30, 2017																	$ 1,951,587	$ 83,534	$ (1,744,917)	$ (6,175)	[1]	$ 284,029
Share-based compensation																	$ 0	7,727	0	0	[1]	7,727
Share-based awards settled in shares (in shares)	98										0
Share-based awards settled in shares	$ 427	$ (427)	$ 0	$ 0	$ 0
Stock options exercised (in shares)																	906
Stock options exercised																	$ 2,847	(2,847)	0	0	[1]	0
Net loss																	0	0	(112,765)	0	[1]	(112,765)
Other comprehensive income (loss)																	$ 0	0	0	(18,303)	[1]	(18,303)
Balance (in shares) at Nov. 30, 2018																	323,223
Balance (Accounting Standards Update 2016-01 [Member]) at Nov. 30, 2018												$ 0	$ 0	$ 378	$ (378)	$ 0
Balance at Nov. 30, 2018																	$ 1,954,861	87,987	(1,857,682)	(24,478)	[1]	160,688
Share-based compensation																	$ 0	6,176	0	0	[1]	6,176
Share-based awards settled in shares (in shares)	32					438					438
Share-based awards settled in shares	$ 120	$ (120)	$ 0	$ 0	$ 0	$ 2,737	$ (2,737)	$ 0	$ 0	[1]	$ 0
Stock options exercised (in shares)																	3,937
Stock options exercised																	$ 7,855	(7,855)	0	0	[1]	0
Net loss																	0	0	(27,761)	0	[1]	(27,761)
Other comprehensive income (loss)																	0	0	0	48	[1]	48
Withholding tax on PSUs																	$ 0	(1,197)	0	0	[1]	(1,197)
Balance (in shares) at Nov. 30, 2019																	327,630
Balance at Nov. 30, 2019																	$ 1,965,573	82,254	(1,885,065)	(24,808)		137,954
Share-based compensation																	$ 0	7,057	0	0		$ 7,057
Share-based awards settled in shares (in shares)						410					648
Share-based awards settled in shares						$ 1,026	$ (1,026)	$ 0	$ 0		$ 0
Stock options exercised (in shares)																	2,372					3,905
Stock options exercised																	$ 5,430	(5,430)	0	0		$ 0
Net loss																	0	0	(33,564)	0		(33,564)
Other comprehensive income (loss)																	0	0	0	932		932
Withholding tax on PSUs																	$ 0	(1,652)	0	0		(1,652)
Balance (in shares) at Nov. 30, 2020																	330,412
Balance at Nov. 30, 2020																	$ 1,972,029	$ 81,203	$ (1,918,629)	$ (23,876)		$ 110,727

[1] Accumulated other comprehensive loss