Earnings Per Share - Computation of Earnings Per Share and Earnings Per Share-Assuming Dilution (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Numerator
Net income	$ 49,918	$ 57,198	$ 87,018
Denominator
Weighted average shares outstanding	33,225,354	39,624,694	39,982,784
Effect of dilutive securities:
Share-based payment awards	797,000	663,000	1,262,000
Weighted average shares outstanding - assuming dilution	34,021,957	40,288,189	41,244,903
Earnings per share	$ 1.50	$ 1.44	$ 2.18
Earnings per share - assuming dilution	$ 1.47	$ 1.42	$ 2.11

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

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.

+ References+ Details

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

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-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A7

-Appendix A

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+ Details

- Definition

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.

+ References+ Details

- Definition

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.

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details