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Accounts Receivable (Details) - USD ($)
$ in Thousands
Oct. 31, 2015
Jan. 31, 2015
Accounts receivable    
Accounts receivable, gross $ 227,083 $ 248,125
Less allowance for doubtful accounts 31,258 31,920
Accounts receivable, net 195,825 216,205
Trade receivables    
Accounts receivable    
Accounts receivable, gross 206,000 229,618
Royalty receivables    
Accounts receivable    
Accounts receivable, gross 11,163 10,118
Other receivables    
Accounts receivable    
Accounts receivable, gross $ 9,920 $ 8,389