Balance Sheet - Accounts and Contracts Receivables (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Accounts Receivable, Net, Current [Abstract]
Accounts receivable	$ 16,250	$ 21,762
Contracts receivable	5,823	2,752
Accounts and contracts receivable	22,073	24,514
Accounts and contracts receivable	22,073	24,514
Less long-term portion	(6,215)	(4,968)
Current accounts and contracts receivable	15,858	19,546
Current accounts and contracts receivable	15,858	19,546
Less current portion of allowance for doubtful accounts	(3,419)	(3,716)
Current portion of accounts and contracts receivable, net of allowance for doubtful accounts	$ 12,439	$ 15,830