Restructuring Provision - Additional Information (Details) - USD ($)	3 Months Ended			6 Months Ended			12 Months Ended
	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2020	Jan. 31, 2022	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 8,100,000						$ 12,600,000
Payments for restructuring					$ 1,356,000	$ 1,837,000	6,700,000
Restructuring charges with non-cash use					1,300,000
Restructuring charges with non-cash portion used					45,000	1,763,000	$ 2,100,000
Write-off related to non-refundable deposits						1,500,000
Provision for restructuring charges	$ 0	$ 0	$ 7,368,000		0	$ 14,608,000
Forecast
Restructuring Cost And Reserve [Line Items]
Restructuring charges				$ 1,100,000
Severance and Employee Related | Minimum
Restructuring Cost And Reserve [Line Items]
Expected annual savings from restructuring plan					14,000,000
Severance and Employee Related | Maximum
Restructuring Cost And Reserve [Line Items]
Expected annual savings from restructuring plan					$ 16,000,000