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Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 31, 2019
Nov. 30, 2017
Nov. 29, 2017
Feb. 28, 2017
LIBOR [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate 1.00%      
Minimum [Member] | LIBOR [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Interest rate 1.00%      
Minimum [Member] | LIBOR [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate 1.00%      
Maximum [Member] | LIBOR [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Interest rate 1.50%      
Maximum [Member] | LIBOR [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate 1.50%      
Bank of America, N.A. [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Principal amount of debt   $ 15,000,000   $ 9,200,000
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] | Second Amendment [Member]        
Debt Instrument [Line Items]        
Revolving loan outstanding     $ 14,600,000