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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, 2019 | Feb. 28, 2019 | Aug. 31, 2018 | Feb. 28, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Shares Purchased | 35 | 25 | 28 | 27
Purchase Price | $ 29.64 | $ 41.82 | $ 34.21 | $ 34.43

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