Accrued expenses and other long-term liabilities (Detail 1) - USD ($) $ in Thousands	Jan. 31, 2018	Oct. 31, 2017
Level 1
Liabilities, Fair Value Disclosure, Recurring	$ 0	$ 0
Level 2
Liabilities, Fair Value Disclosure, Recurring	0	0
Level 3
Liabilities, Fair Value Disclosure, Recurring	$ 206	$ 236