Accounts and Contracts Receivables - Accounts and Contracts Receivables (Detail) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Receivables [Abstract]
Accounts receivable	$ 16,392	$ 21,762
Contracts receivable	4,921	2,752
Accounts and contracts receivable	21,313	24,514
Less long-term portion	(6,934)	(4,968)
Current accounts and contracts receivable	14,379	19,546
Less current portion of allowance for doubtful accounts	(3,885)	(3,716)
Current portion of accounts and contracts receivable, net of allowance for doubtful accounts	$ 10,494	$ 15,830