Short-Term and Long-Term Debt (Details) - USD ($)	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2017
Secured debt | Term Loan 2022
Debt Instrument [Line Items]
Debt issuance costs, net	$ 2,923,000		$ 3,100,000
Amortization of debt issuance costs included in interest expense	200,000	$ 0
Convertible notes payable | Convertible senior notes due 2018 and 2020
Debt Instrument [Line Items]
Debt issuance costs, net	1,700,000		$ 2,100,000
Amortization of debt issuance costs included in interest expense	$ 400,000	$ 500,000