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Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Apr. 30, 2020	Jan. 31, 2020	Jul. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Transfers into level 1 to level 2, assets	$ 0
Transfers into level 2 to level 1, assets	0
Transfers into level 1 to level 2, liabilities	0
Transfers into level 2 to level 1, liabilities	0
Transfers into level 3, assets	0
Transfers out of level 3, assets	0
Transfers into level 3, liabilities	0
Transfers out of level 3, liabilities	0
MVMT Watches, Inc.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Business acquisition, liability		$ 0	$ 1,900,000
Business acquisition, decrease of liability	$ 200,000	$ (16,900,000)
Short-term investment
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value, investment	The fair value of the short-term investment, which is a guaranteed investment certificate, is based on its purchase price plus one half of a percent calculated annually