Income Taxes Statutory federal income tax rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Federal Income Tax Expense (Benefit), Continuing Operations									$ 2,248	$ (519)	$ 3,715
State and Local Income Tax Expense (Benefit), Continuing Operations									(1,639)	65	499
Valuation allowance change									5,749	(5,452)	1,337
Domestic tax credits									(803)	(930)	(223)
Domestic production activities deduction									(455)	(391)	(340)
Foreign operations									1,182	2,240	1,401
Adjustment of uncertain tax positions									(83)	(173)	(340)
Provision to return adjustment for tax law extensions subsequent to year-end									285	202	(1,380)
Other									636	(194)	41
Total income tax expense (benefit)	$ 434	$ 4,439	$ 2,323	$ (76)	$ (4,949)	$ 1,344	$ 364	$ (1,911)	$ 7,120	$ (5,152)	$ 4,710