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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		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 64,176	$ 56,358	$ 102,642	$ 93,365
Shares used in net income per share computation:
Weighted average shares outstanding - basic (in shares)	165,630	164,120	165,474	163,765
Effect of potentially dilutive equivalent shares (in shares)	3,604	4,958	3,522	4,945
Weighted average shares outstanding - diluted (in shares)	169,234	169,078	168,996	168,710
Net income per share:
Basic (in dollars per share)	$ 0.39	$ 0.34	$ 0.62	$ 0.57
Diluted (in dollars per share)	$ 0.38	$ 0.33	$ 0.61	$ 0.55
Anti-dilutive equivalents shares excluded (in shares)	800	600	1,200	1,200

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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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