Income Taxes Statutory federal income tax rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Federal Income Tax Expense (Benefit), Continuing Operations									$ 1,461	$ 2,248	$ (519)
State and Local Income Tax Expense (Benefit), Continuing Operations									(321)	(1,639)	65
Valuation allowance change									674	5,749	(5,452)
Domestic tax credits									(3,308)	(803)	(930)
Domestic production activities deduction									0	(455)	(391)
Foreign operations									1,188	1,182	2,240
Adjustment of uncertain tax positions									1,886	(83)	(173)
Provision to return adjustment									(3,355)	285	202
Effective income tax rate change in enacted tax rate, amount									(3,966)	0	0
Other									522	636	(194)
Total income tax expense (benefit)	$ 4,635	$ (7,014)	$ 218	$ (3,058)	$ 434	$ 4,439	$ 2,323	$ (76)	$ (5,219)	$ 7,120	$ (5,152)