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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]    
Net sales $ 608,480 $ 529,946
Cost of goods sold 382,171 334,774
Amortization of intangible assets and purchase accounting effect on inventory 2,372 1,504
Gross profit 223,937 193,668
Operating expenses:    
Marketing and selling 114,584 102,378
Research and development 38,987 35,099
General and administrative 25,473 25,409
Amortization of intangible assets and acquisition-related costs 2,521 1,390
Change in fair value of contingent consideration for business acquisition 0 (1,978)
Restructuring charges (credits), net 9,921 (55)
Total operating expenses 191,486 162,243
Operating income 32,451 31,425
Interest income 2,369 1,175
Other expense, net (1,571) (1,029)
Income before income taxes 33,249 31,571
Benefit from income taxes (5,217) (5,436)
Net income $ 38,466 $ 37,007
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
Weighted average shares used to compute net income per share:    
Basic (in shares) 165,317 163,407
Diluted (in shares) 168,756 168,339