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Net Income Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 38,466	$ 37,007
Shares used in net income per share computation:
Weighted average shares outstanding - basic (in shares)	165,317	163,407
Effect of potentially dilutive equivalent shares (in shares)	3,439	4,932
Weighted average shares outstanding - diluted (in shares)	168,756	168,339
Net income per share:
Net income per share - basic (in dollars per share)	$ 0.23	$ 0.23
Net income per share - diluted (in dollars per share)	$ 0.23	$ 0.22
Anti-dilutive equivalents shares excluded (in shares)	1,500	1,400

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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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