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Property and Equipment at Cost (Detail) (USD $) In Thousands, unless otherwise specified |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 Machinery and equipment | Jan. 31, 2013 Machinery and equipment | Jan. 31, 2014 Machinery and equipment Minimum | Jan. 31, 2014 Machinery and equipment Maximum | Jan. 31, 2014 Leasehold improvements | Jan. 31, 2013 Leasehold improvements | Jan. 31, 2014 Leasehold improvements Minimum | Jan. 31, 2014 Leasehold improvements Maximum | Jan. 31, 2014 Furniture and fixtures | Jan. 31, 2013 Furniture and fixtures | Jan. 31, 2014 Furniture and fixtures Minimum | Jan. 31, 2014 Furniture and fixtures Maximum | Jan. 31, 2014 Computer equipment and software | Jan. 31, 2013 Computer equipment and software | Jan. 31, 2014 Computer equipment and software Minimum | Jan. 31, 2014 Computer equipment and software Maximum
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of fixed assets |  |  |  |  | 4 years | 5 years |  |  | 1 year | 19 years |  |  | 3 years | 10 years |  |  | 2 years | 5 years
Property and equipment, gross | $ 101,206 | $ 68,812 | $ 2,077 | $ 2,086 |  |  | $ 60,817 | $ 44,656 |  |  | $ 30,883 | $ 17,047 |  |  | $ 7,429 | $ 5,023 |  |
Less: accumulated depreciation | 38,374 | 27,996 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | $ 62,832 | $ 40,816 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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