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Stockholders' Equity - Summary of Shares Purchased by Employees Under the Stock Purchase Plan (Detail) - $ / shares shares in Thousands | 6 Months Ended
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Aug. 31, 2018 | Feb. 28, 2018 | Aug. 31, 2017 | Feb. 28, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Shares Purchased | 28 | 27 | 26 | 24
Purchase Price | $ 34.21 | $ 34.43 | $ 31.71 | $ 31.03

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