Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Oct. 31, 2017
Income Taxes (Textual) [Abstract]
Income tax provision	$ 39,396	$ (509)
Effective Income Tax Rate Reconciliation, Percent	26.00%	(0.40%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ (31,200)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	23.30%	35.00%
Unrecognized Tax Benefits	$ 9,700
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range Not Possible	During the next 12 months, it is reasonably possible that our unrecognized tax benefits will change, but we are not able to provide a range of such change.
State and Local Jurisdiction [Member]
Income Taxes (Textual) [Abstract]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	6.80%	6.60%