Reconciliation of Numerators and Denominators of Earnings Per Share Calculation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
May 31, 2017	May 31, 2016
Earnings Per Share [Abstract]
Net income, basic and diluted	$ 73,190	$ 61,184
Weighted average common shares outstanding	177,243	181,168
Incremental shares attributable to assumed vesting or exercise of outstanding equity award shares	2,974	3,019
Dilutive effect of convertible notes	1,593
Diluted shares	181,810	184,187
Diluted net income per share	$ 0.40	$ 0.33

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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