CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Paid-In Capital	Retained Earnings
Beginning Balance at Oct. 31, 2014	$ 897,948	$ 23,130	$ 150,122	$ 724,696
Beginning Balance (in shares) at Oct. 31, 2014		23,130,503
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for year	216,001			216,001
Cash dividends	(31,092)			(31,092)
Purchase of common stock	(55,192)	$ (700)	(40,540)	(13,952)
Purchase of common stock (in shares)		(700,003)
Issuance of stock under stock compensation plans	(9,883)	$ 91	(9,974)
Issuance of stock under stock compensation plans (in shares)		90,375
Amortization of unearned compensation	12,079		12,079
Ending Balance at Oct. 31, 2015	1,029,861	$ 22,521	111,687	895,653
Ending Balance (in shares) at Oct. 31, 2015		22,520,875
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for year	188,961			188,961
Cash dividends	(42,900)			(42,900)
Issuance of stock under stock compensation plans	841	$ 172	669
Issuance of stock under stock compensation plans (in shares)		172,350
Amortization of unearned compensation	13,499		13,499
Ending Balance at Oct. 31, 2016	1,190,262	$ 22,693	125,855	1,041,714
Ending Balance (in shares) at Oct. 31, 2016		22,693,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for year	279,745			279,745
Cash dividends	(46,399)			(46,399)
Issuance of stock under stock compensation plans	(5,623)	$ 110	(5,733)
Issuance of stock under stock compensation plans (in shares)		109,465
Amortization of unearned compensation	14,877		14,877
Ending Balance at Oct. 31, 2017	$ 1,432,862	$ 22,803	$ 134,999	$ 1,275,060
Ending Balance (in shares) at Oct. 31, 2017		22,802,690