Accounts Receivables Accounts Receivables - Accounts Receivable (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Receivables [Abstract]
Current accounts receivable	$ 14,195	$ 14,379
Long-term accounts receivable	712	6,934
Accounts receivable	14,907	21,313
Less current portion of allowance for doubtful accounts	(2,113)	(3,885)
Less long-term portion of allowance for doubtful accounts	0	(2,282)
Less total allowance for doubtful accounts	(2,113)	(6,167)
Current accounts receivable, net of allowance for doubtful accounts	12,082	10,494
Long-term accounts receivable, net of allowance for doubtful accounts	712	4,652
Total accounts receivable, net of allowance for doubtful accounts	$ 12,794	$ 15,146