Balance Sheet Components (Details Textual) - USD ($)	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020	May 31, 2020
Balance Sheet Related Disclosures [Abstract]
Property and equipment pledged as collateral	$ 0		$ 0
Depreciation	3,600,000	$ 3,500,000
Amortization	600,000	300,000
Goodwill	340,877,000		$ 340,877,000
Amortization expense	6,300,000	7,200,000
Investment owned	2,000,000.0			$ 1,000,000.0
Impairment loss	$ 0	$ 0