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, 2017
Jan. 31, 2016
Jan. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 47,368    
Balance at end of period 58,134 $ 47,368  
Deferred Tax Assets Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 47,368 30,369 $ 20,789
Additions, Charged to costs and expenses 10,766 16,999 9,580
Balance at end of period 58,134 47,368 30,369
Accounts Receivable Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 415 400 327
Additions, Charged to costs and expenses 597 59 80
Additions, Charged to other accounts (61)    
Deductions and write-offs (75) (44) (7)
Balance at end of period $ 876 $ 415 $ 400