Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 27,922	$ 32,810	$ 6,118	$ (38,576)	$ (22,871)	$ 53,362	$ 40,636	$ (17,833)	$ 28,274	$ 53,294	$ 61,431
Distributed and undistributed (earnings) to unvested restricted stock									(372)	(778)	(878)
Distributed and undistributed earnings to common shareholders — Basic									$ 27,902	$ 52,516	$ 60,553
Weighted average shares outstanding — Basic (in shares)									21,943	21,829	22,429
Weighted average shares outstanding — Diluted (in shares)									21,943	21,829	22,429
Earnings per common share - Basic (in usd per share)									$ 1.27	$ 2.41	$ 2.70
Earnings per common share - Diluted (in usd per share)	$ 1.26	$ 1.48	$ 0.28	$ (1.76)	$ (1.05)	$ 2.41	$ 1.83	$ (0.82)	$ 1.27	$ 2.41	$ 2.70