Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Accounts Receivable Allowance [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at beginning of period $ 16 $ 876
Additions, Charged to costs and expenses 1,779 79
Additions, Charged to other accounts   10
Deductions and write-offs (1,218) (949)
Balance at end of period 577 16
Deferred Tax Assets Valuation Allowance [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at beginning of period 38,305 58,134
Additions, Charged to costs and expenses 3,674 (19,829)
Balance at end of period $ 41,979 $ 38,305