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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]    
Net sales $ 529,946 $ 479,864
Cost of goods sold 334,774 309,625
Amortization of intangible assets and purchase accounting effect on inventory 1,504 1,613
Gross profit 193,668 168,626
Operating expenses:    
Marketing and selling 102,378 83,872
Research and development 35,099 31,951
General and administrative 25,354 25,655
Amortization of intangible assets and acquisition-related costs 1,390 1,293
Change in fair value of contingent consideration for business acquisition (1,978) 0
Total operating expenses 162,243 142,771
Operating income 31,425 25,855
Interest income, net 1,175 151
Other expense, net (1,029) (1,008)
Income before income taxes 31,571 24,998
Provision for (benefit from) income taxes (5,436) 3,057
Net income $ 37,007 $ 21,941
Net income per share:    
Net income per share - basic (in dollars per share) $ 0.23 $ 0.14
Net income per share - diluted (in dollars per share) $ 0.22 $ 0.13
Weighted average shares used to compute net income per share:    
Basic (in shares) 163,407 162,130
Diluted (in shares) 168,339 164,303