Significant Accounting Policies (Details) $ in Thousands	Oct. 31, 2017 USD ($)
Significant Accounting Policies [Line Items]
Cumulative adjustment	$ 62,123
Retained earnings
Significant Accounting Policies [Line Items]
Cumulative adjustment	61,291
Retained earnings | ASU 2016-09, Excess tax benefit component
Significant Accounting Policies [Line Items]
Cumulative adjustment	62,100
Retained earnings | ASU 2016-09, Forfeiture rate component
Significant Accounting Policies [Line Items]
Cumulative adjustment	$ 800