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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]    
Net sales $ 644,225 $ 608,480
Cost of goods sold 401,978 382,171
Amortization of intangible assets and purchase accounting effect on inventory 3,271 2,372
Gross profit 238,976 223,937
Operating expenses:    
Marketing and selling 123,033 114,584
Research and development 42,243 38,987
General and administrative 22,159 25,473
Amortization of intangible assets and acquisition-related costs 3,596 2,521
Restructuring charges, net 478 9,921
Total operating expenses 191,509 191,486
Operating income 47,467 32,451
Interest income 2,553 2,369
Other income (expense), net 1,861 (1,571)
Income before income taxes 51,881 33,249
Provision for (benefit from) income taxes 6,536 (5,217)
Net income $ 45,345 $ 38,466
Net income per share:    
Basic (in dollars per share) $ 0.27 $ 0.23
Diluted (in dollars per share) $ 0.27 $ 0.23
Weighted average shares used to compute net income per share:    
Basic (in shares) 166,302 165,317
Diluted (in shares) 168,797 168,756