Accounts and Contracts Receivables - Accounts and Contracts Receivables (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Accounts Receivable, Net, Current [Abstract]
Accounts receivable	$ 21,762	$ 27,691
Contracts receivable	2,752	2,877
Accounts and contracts receivable	24,514	30,568
Less long-term portion	(4,968)	(4,972)
Current accounts and contracts receivable	19,546	25,596
Less current portion of allowance for doubtful accounts	(3,716)	(3,633)
Current portion of accounts and contracts receivable, net of allowance for doubtful accounts	$ 15,830	$ 21,963