Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

v3.3.1.900
Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 30,369    
Balance at end of period 47,368 $ 30,369  
Deferred Tax Assets Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 30,369 20,789 $ 19,965
Additions, Charged to costs and expenses 16,999 9,580 824
Balance at end of period 47,368 30,369 20,789
Accounts Receivable Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 400 327 946
Additions, Charged to costs and expenses 59 80 286
Additions, Charged to other accounts     31
Deductions and write-offs (44) (7) (936)
Balance at end of period $ 415 $ 400 $ 327