Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Statement of Comprehensive Income [Abstract]
Net unrealized holding gains (losses) on investments arising during the period, tax provision (benefit)	$ (8)	$ 67	$ (27)	$ 148
Less: reclassification adjustment for net (gains) losses included in net income (loss), tax provision (benefit)	0	0	0	0
Net change in unrealized holding gains (losses) on investments, tax provision (benefit)	(8)	67	(27)	148
Net unrealized foreign exchange gains (losses) arising during the period, tax provision (benefit)	1,348	(7,838)	4,601	(10,985)
Less: reclassification adjustment for foreign exchange (gains) losses included in net income (loss), tax provision (benefit)	0	0	0	0
Net change in unrealized foreign exchange gains (losses), tax provision (benefit)	1,348	(7,838)	4,601	(10,985)
Net unrealized gains (losses) on instrument specific credit risk arising during the period, tax provision (benefit)	(6,327)	51,167	(28,509)	59,106
Less: reclassification adjustment for instrument specific credit risk (gains) losses included in net income (loss), tax provision (benefit)	849	444	920	530
Net change in unrealized instrument specific credit risk gains (losses), tax provision (benefit)	(7,176)	50,723	(29,429)	58,576
Net pension gains (losses) arising during the period, tax provision (benefit)	0	0	0	0
Less: reclassification adjustment for pension (gains) losses included in net income (loss), tax provision (benefit)	264	214	525	438
Net change in pension liability, tax provision (benefit)	$ (264)	$ (214)	$ (525)	$ (438)