COMPUTATION OF EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Net income	$ 27,521	$ 25,429	$ 54,252	$ 51,375
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average common shares-basic	44,556	47,087	45,664	47,607
Dilutive effect of employee equity incentive plans	1,161	1,437	1,286	1,541
Weighted average common shares-diluted	45,717	48,524	46,950	49,148
Earnings per common share-basic	$ 0.62	$ 0.54	$ 1.19	$ 1.08
Earnings per common share-diluted	$ 0.6	$ 0.52	$ 1.16	$ 1.05
Potentially dilutive securities excluded from earnings per common share-diluted because their effect is anti-dilutive	1,946	2,254	1,781	2,214

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Glossary Contingent Stock Agreement

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+ Details

- Definition

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

+ References

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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

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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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