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Restructuring Provision - Summary of Rollforward of Provision Related Corporate Initiatives, Including Provision Associated with Restructuring Plan (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Restructuring Cost And Reserve [Line Items]            
Beginning Balance   $ 3,781,000   $ 3,781,000 $ 0 $ 0
Provision $ 0 0 $ 7,368,000 0 14,608,000  
Non-Cash Use       (45,000) (1,763,000) (2,100,000)
Cash Payments       (1,356,000) (1,837,000) (6,700,000)
Ending Balance 2,380,000   11,008,000 2,380,000 11,008,000 3,781,000
Restructuring Plan | Severance and Employee Related            
Restructuring Cost And Reserve [Line Items]            
Beginning Balance   2,378,000 [1]   2,378,000 [1] 0 0
Provision       0 [1] 6,966,000  
Non-Cash Use       0 [1] 0  
Cash Payments       (1,350,000) [1] (1,160,000)  
Ending Balance 1,028,000 [1]   5,806,000 1,028,000 [1] 5,806,000 2,378,000 [1]
Restructuring Plan | Other            
Restructuring Cost And Reserve [Line Items]            
Beginning Balance [2]   51,000   51,000 0 0
Provision [2]       0 402,000  
Non-Cash Use [2]       0 (198,000)  
Cash Payments [2]       (6,000) (115,000)  
Ending Balance [2] 45,000   89,000 45,000 89,000 51,000
Other Corporate Initiative | Severance and Employee Related            
Restructuring Cost And Reserve [Line Items]            
Beginning Balance   0   0 0 0
Provision       0 936,000  
Non-Cash Use       0 0  
Cash Payments       0 (395,000)  
Ending Balance 0   541,000 0 541,000 0
Other Corporate Initiative | Inventory            
Restructuring Cost And Reserve [Line Items]            
Beginning Balance [3]   407,000   407,000 0 0
Provision [3]       0 3,507,000  
Non-Cash Use [3]       (45,000) (47,000)  
Cash Payments [3]       0 0  
Ending Balance [3] 362,000   3,460,000 362,000 3,460,000 407,000
Other Corporate Initiative | Accounts Receivable            
Restructuring Cost And Reserve [Line Items]            
Beginning Balance [4]   926,000   926,000 0 0
Provision [4]       0 1,075,000  
Non-Cash Use [4]       0 0  
Cash Payments [4]       0 0  
Ending Balance [4] 926,000   1,075,000 926,000 1,075,000 926,000
Other Corporate Initiative | Other            
Restructuring Cost And Reserve [Line Items]            
Beginning Balance   $ 19,000 [2]   19,000 [2] 0 0
Provision       0 [2] 1,722,000  
Non-Cash Use       0 [2] (1,518,000)  
Cash Payments       0 [2] (167,000)  
Ending Balance $ 19,000 [2]   $ 37,000 $ 19,000 [2] $ 37,000 $ 19,000 [2]
[1] $0.6 million included in Accrued payroll and benefits and $0.4 million included in Capital in excess of par value.
[2] Balance included in Accrued liabilities.
[3] Reserve included in Inventories.
[4] Reserve included in Trade receivables, net.