COMPUTATION OF EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 28,672	$ 26,953
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average common shares-basic	41,619	42,692
Dilutive effect of employee equity incentive plans	847	958
Weighted average common shares-diluted	42,466	43,650
Basic earnings per common share	$ 0.69	$ 0.63
Diluted earnings per common share	$ 0.68	$ 0.62
Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive	547	292

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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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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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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