Balance Sheet - Accounts and Contracts Receivables (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Accounts Receivable, Net, Current [Abstract]
Accounts receivable	$ 21,154	$ 27,691
Contracts receivable	2,753	2,877
Accounts and contracts receivable	23,907	30,568
Less long-term portion	(4,967)	(4,972)
Current accounts and contracts receivable	18,940	25,596
Less allowance for doubtful accounts	(5,828)	(5,821)
Current portion of accounts and contracts receivable, net of allowance for doubtful accounts	$ 13,112	$ 19,775