Stockholders' Equity - Schedule of 2017 Plan Options Outstanding (Details) - 2017 Plan - Employee Stock Option - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017
Number of Shares
Outstanding at beginning of period (in shares)	0
Total options authorized (in shares)		400,000
Options granted (in shares)	(206,500)
Expired (in shares)	0
Forfeited (in shares)	0
Options available (in shares)	193,500
Outstanding at end of period (in shares)	206,500	0
Exercisable (in shares)	0
Weighted- average Exercise Price
Exercised (in dollars per share)	$ 38.03
Outstanding (in dollars per share)	$ 38.03
Weighted- average Remaining Contractual Term (years)
Outstanding	9 years 10 months 13 days
Aggregate Intrinsic Value (in Thousands)
Outstanding	$ 535