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Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Detail) - Schedule of Valuation and Qualifying Account (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011
Allowance for Doubtful Accounts [Member] |  |  |
Valuation Allowances and Reserves, Beginning Balance |  | $ 10 | $ 168
Valuation Allowances and Reserves, Charged to Other Accounts |  | 10 | 158
Valuation Allowances and Reserves, Ending Balance |  |  | 10
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Valuation Allowances and Reserves, Beginning Balance | 1,676 | 1,242 | 578
Valuation Allowances and Reserves, Charged to Cost and Expense | 215 | 434 | 664
Valuation Allowances and Reserves, Ending Balance | $ 1,891 | $ 1,676 | $ 1,242

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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Period Type: | instant

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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