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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Income Statement [Abstract]        
Net sales $ 691,146 $ 632,470 $ 1,299,626 $ 1,162,416
Cost of goods sold 432,063 402,722 814,234 737,496
Amortization of intangible assets and purchase accounting effect on inventory 2,966 2,011 5,338 3,515
Gross profit 256,117 227,737 480,054 421,405
Operating expenses:        
Marketing and selling 121,801 107,386 236,385 209,764
Research and development 39,542 36,647 78,529 71,746
General and administrative 25,206 25,266 50,679 50,675
Amortization of intangible assets and acquisition-related costs 4,317 2,491 6,838 3,881
Change in fair value of contingent consideration for business acquisition 0 (2,930) 0 (4,908)
Restructuring charges (credits), net 119 (61) 10,040 (116)
Total operating expenses 190,985 168,799 382,471 331,042
Operating income 65,132 58,938 97,583 90,363
Interest income 1,858 1,048 4,227 2,223
Other income (expense), net 3,389 459 1,818 (570)
Income before income taxes 70,379 60,445 103,628 92,016
Provision for (benefit from) income taxes 6,203 4,087 986 (1,349)
Net income $ 64,176 $ 56,358 $ 102,642 $ 93,365
Net income per share:        
Net income per share - basic (in dollars per share) | $ / shares $ 0.39 $ 0.34 $ 0.62 $ 0.57
Net income per share - diluted (in dollars per share) | $ / shares $ 0.38 $ 0.33 $ 0.61 $ 0.55
Weighted average shares used to compute net income per share:        
Basic (in shares) | shares 165,630 164,120 165,474 163,765
Diluted (in shares) | shares 169,234 169,078 168,996 168,710
Cash dividend per share (in dollars per share) | (per share) $ 0.69 $ 0.63 $ 0.69 $ 0.63