Balance Sheet - Accounts and Contracts Receivables (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Accounts Receivable, Net, Current [Abstract]
Accounts receivable	$ 12,291	$ 16,392
Contracts receivable	4,402	4,921
Accounts and contracts receivable	16,693	21,313
Less long-term portion	(800)	(6,934)
Current accounts and contracts receivable	15,893	14,379
Less current portion of allowance for doubtful accounts	(3,560)	(3,885)
Current portion of accounts and contracts receivable, net of allowance for doubtful accounts	$ 12,333	$ 10,494

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(9))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant