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Stockholders' Equity - Summary of Shares Purchased by Employees Under the Stock Purchase Plan (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended
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Aug. 31, 2014 | Feb. 28, 2014 | Aug. 31, 2013 | Feb. 28, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Shares Purchased | 21 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 23 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 27 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 26 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Purchase Price | $ 30.55 us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased | $ 27.83 us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased | $ 23.42 us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased | $ 23.34 us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased

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- Definition Weighted average purchase price of capital shares purchased through an employee stock ownership plan. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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