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, 2018
Jan. 31, 2017
Jan. 31, 2016
Accounts Receivable Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 876 $ 415 $ 400
Additions, Charged to costs and expenses 79 597 59
Additions, Charged to other accounts 10 (61)  
Deductions and write-offs (949) (75) (44)
Balance at end of period 16 876 415
Deferred Tax Assets Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 58,134 47,368 30,369
Additions, Charged to costs and expenses (19,829) 10,766 16,999
Balance at end of period $ 38,305 $ 58,134 $ 47,368