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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Income Taxes [Line Items]        
U.S. federal corporate income tax rate 21.00% 33.80% 35.00%  
One-time transition tax on certain unrepatriated earnings of foreign subsidiaries payable period 8 years      
Provisional tax expense   $ 64,705,000    
Additional provisional tax expense $ 1,197,000      
Percentage of U.S. shareholder’s pro rata share 10.00%      
Net deferred tax assets $ 52,882,000 46,202,000    
Valuation allowance for certain other foreign and state net operating loss carryforwards 0      
Cash and cash equivalents 358,260,000 282,220,000 $ 248,140,000 $ 265,276,000
Unrecognized tax benefit that, if recognized, would impact the effective tax rate 21,319,000 4,127,000    
Recognized (benefit)/expense in interest and penalties 449,000 (209,000) $ (218,000)  
Accrued amounts for payment of interest and penalties 822,000 568,000    
Unrecognized tax benefits, lower bound 0      
Unrecognized tax benefits, upper bound 3,083,000      
U.S. Federal        
Income Taxes [Line Items]        
Net deferred tax assets 22,885,000 19,061,000    
Net operating loss carryforwards, do not expire 2,866,000      
Net operating loss carryforwards 7,641,000      
Tax credit carryforwards $ 5,954,000      
U.S. Federal | Earliest Tax Year        
Income Taxes [Line Items]        
Expiration date 2021      
Tax credit expiration date 2021      
U.S. Federal | Latest Tax Year        
Income Taxes [Line Items]        
Expiration date 2038      
Tax credit expiration date 2031      
State and Local Jurisdiction        
Income Taxes [Line Items]        
Net deferred tax assets $ 15,079,000 16,848,000    
Foreign Jurisdictions        
Income Taxes [Line Items]        
Net deferred tax assets 14,918,000 $ 10,293,000    
Net operating loss carryforwards, expire 2019 through 2029 471,000      
Net operating loss carryforwards, do not expire 5,689,000      
Cash and cash equivalents 224,876,000      
Cumulative undistributed earnings 352,076,000      
Additional federal income taxes due to repatriation $ 0      
Foreign Jurisdictions | Earliest Tax Year        
Income Taxes [Line Items]        
Expiration date 2019      
Foreign Jurisdictions | Latest Tax Year        
Income Taxes [Line Items]        
Expiration date 2029      
Maximum        
Income Taxes [Line Items]        
U.S. federal corporate income tax rate   35.00%