CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Paid-In Capital	Retained Earnings
Beginning Balance (in shares) at Oct. 31, 2018		22,099,780
Beginning Balance at Oct. 31, 2018	$ 1,387,893	$ 22,100	$ 81,269	$ 1,284,524
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(17,833)			(17,833)
Dividends	(7,089)			(7,089)
Stock compensation plan transactions (in shares)		53,688
Stock compensation plan transactions	(2,073)	$ 53	(2,126)
Amortization of unearned compensation	2,313		2,313
Ending Balance (in shares) at Jan. 31, 2019		22,153,468
Ending Balance at Jan. 31, 2019	1,363,211	$ 22,153	81,456	1,259,602
Beginning Balance (in shares) at Oct. 31, 2018		22,099,780
Beginning Balance at Oct. 31, 2018	1,387,893	$ 22,100	81,269	1,284,524
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,165
Ending Balance (in shares) at Jul. 31, 2019		22,152,741
Ending Balance at Jul. 31, 2019	1,450,465	$ 22,153	88,891	1,339,421
Beginning Balance (in shares) at Jan. 31, 2019		22,153,468
Beginning Balance at Jan. 31, 2019	1,363,211	$ 22,153	81,456	1,259,602
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,636			40,636
Dividends	(7,089)			(7,089)
Stock compensation plan transactions (in shares)		777
Stock compensation plan transactions	1,629	$ 1	1,628
Amortization of unearned compensation	2,325		2,325
Ending Balance (in shares) at Apr. 30, 2019		22,154,245
Ending Balance at Apr. 30, 2019	1,400,712	$ 22,154	85,409	1,293,149
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,362			53,362
Dividends	(7,090)			(7,090)
Stock compensation plan transactions (in shares)		(1,504)
Stock compensation plan transactions	114	$ (1)	115
Amortization of unearned compensation	3,367		3,367
Ending Balance (in shares) at Jul. 31, 2019		22,152,741
Ending Balance at Jul. 31, 2019	1,450,465	$ 22,153	88,891	1,339,421
Beginning Balance (in shares) at Oct. 31, 2019		22,203,920
Beginning Balance at Oct. 31, 2019	1,417,675	$ 22,204	86,010	1,309,461
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(38,576)			(38,576)
Dividends	(7,113)			(7,113)
Stock compensation plan transactions (in shares)		25,292
Stock compensation plan transactions	(4,696)	$ 25	(4,721)
Amortization of unearned compensation	2,082		2,082
Ending Balance (in shares) at Jan. 31, 2020		22,229,212
Ending Balance at Jan. 31, 2020	1,369,372	$ 22,229	83,371	1,263,772
Beginning Balance (in shares) at Oct. 31, 2019		22,203,920
Beginning Balance at Oct. 31, 2019	1,417,675	$ 22,204	86,010	1,309,461
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	352
Ending Balance (in shares) at Jul. 31, 2020		22,239,973
Ending Balance at Jul. 31, 2020	1,399,288	$ 22,240	88,582	1,288,466
Beginning Balance (in shares) at Jan. 31, 2020		22,229,212
Beginning Balance at Jan. 31, 2020	1,369,372	$ 22,229	83,371	1,263,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,118			6,118
Dividends	(7,117)			(7,117)
Stock compensation plan transactions (in shares)		10,362
Stock compensation plan transactions	1,109	$ 10	1,099
Amortization of unearned compensation	1,960		1,960
Ending Balance (in shares) at Apr. 30, 2020		22,239,574
Ending Balance at Apr. 30, 2020	1,371,442	$ 22,239	86,430	1,262,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32,810			32,810
Dividends	(7,117)			(7,117)
Stock compensation plan transactions (in shares)		399
Stock compensation plan transactions	153	$ 1	152
Amortization of unearned compensation	2,000		2,000
Ending Balance (in shares) at Jul. 31, 2020		22,239,973
Ending Balance at Jul. 31, 2020	$ 1,399,288	$ 22,240	$ 88,582	$ 1,288,466