New Accounting Standards (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Feb. 01, 2019	Jan. 31, 2019	Oct. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 22,251		$ 0	$ 0
Lease liabilities	$ 24,284
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 23,900
Lease liabilities		$ 25,600