Short-Term and Long-Term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Oct. 31, 2017
Secured debt | Term Loan 2022
Debt Instrument [Line Items]
Debt issuance costs, net	$ 2,740		$ 3,100
Amortization of debt issuance costs included in interest expense	400	$ 200
Convertible notes payable | Convertible senior notes due 2018 and 2020
Debt Instrument [Line Items]
Debt issuance costs, net	1,300		$ 2,100
Amortization of debt issuance costs included in interest expense	$ 800	$ 1,000