Balance Sheet - Accounts Receivable (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Accounts receivable:
Accounts receivable	$ 25,029	$ 30,032
Allowance for doubtful accounts	(6,936)	(6,339)
Total accounts receivable, net	$ 18,093	$ 23,693