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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Feb. 10, 2023
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Income Taxes [Line Items]          
Net deferred tax assets   $ 48,467,000 $ 46,176,000    
Valuation allowance for certain other foreign and state net operating loss carryforwards   0      
Cash and cash equivalents   290,481,000 178,321,000    
Unrecognized tax benefit that, if recognized, would impact the effective tax rate   1,044,000 23,066,000    
Recognized (benefit)/expense in interest and penalties   5,878,000 1,629,000 $ 1,145,000  
Accrued amounts for payment of interest and penalties   337,000 6,214,000    
Unrecognized tax benefits, lower bound   0      
Unrecognized tax benefits, upper bound         $ 155,000
Amortization of tax credit investment   17,224,000 15,906,000 0  
Income tax expense   97,710,000 93,933,000 $ 61,580,000  
Investment Tax Credit   62,120,000      
Total payment   100,000,000      
U.S. Affordable Housing Real Estate Partnership          
Income Taxes [Line Items]          
Committed to invest in realestate $ 100,000,000        
Amortization of tax credit investment   17,224,000 15,906,000    
initial payment $ 20,000,000        
Income Tax Examination, Interest Expense   4,906,000 6,190,000    
Income tax expense   24,110,000 22,575,000    
Investment period 5 years        
U.S. Federal          
Income Taxes [Line Items]          
Net deferred tax assets   24,557,000 18,421,000    
Net operating loss carryforwards, do not expire   10,211,000      
Net operating loss carryforwards   20,355,000      
Tax credit carryforwards   $ 4,542,000      
U.S. Federal | Earliest Tax Year          
Income Taxes [Line Items]          
Expiration date   2030      
Tax credit expiration date   2027      
U.S. Federal | Latest Tax Year          
Income Taxes [Line Items]          
Expiration date   2044      
Tax credit expiration date   2030      
State and Local Jurisdiction          
Income Taxes [Line Items]          
Net deferred tax assets   $ 18,256,000 19,637,000    
Foreign Jurisdictions          
Income Taxes [Line Items]          
Net deferred tax assets   5,654,000 $ 8,118,000    
Net operating loss carryforwards, expire 2019 through 2029   54,299,000      
Cash and cash equivalents   131,161,000      
Accumulated undistributed earning   $ 197,842,000