Stockholders' Equity - Summary of Shares Purchased by Employees Under the Stock Purchase Plan (Detail) - $ / shares shares in Thousands	6 Months Ended
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

Number of shares issued during the period as a result of an employee stock purchase plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration