Income Taxes Statutory federal income tax rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Income Tax Disclosure [Abstract]
Federal Income Tax Expense (Benefit), Continuing Operations									$ (4,182)	$ 1,461	$ 2,248
State and Local Income Tax Expense (Benefit), Continuing Operations									(42)	(321)	(1,639)
Valuation allowance change									3,995	674	5,749
Domestic tax credits									(3,100)	(3,308)	(803)
Domestic production activities deduction									0	0	(455)
Foreign operations									1,368	1,188	1,182
Adjustment of uncertain tax positions									595	1,886	(83)
Provision to return adjustment									247	(3,355)	285
Effective income tax rate change in enacted tax rate, amount									0	(3,966)	0
Other									508	522	636
Total income tax expense (benefit)	$ 2,001	$ (973)	$ 1,448	$ (3,087)	$ 4,635	$ (7,014)	$ 218	$ (3,058)	$ (611)	$ (5,219)	$ 7,120