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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Income Statement [Abstract]        
Net sales $ 632,470 $ 564,304 $ 1,162,416 $ 1,044,168
Cost of goods sold 402,722 356,268 737,496 665,893
Amortization of intangible assets and purchase accounting effect on inventory 2,011 1,163 3,515 2,776
Gross profit 227,737 206,873 421,405 375,499
Operating expenses:        
Marketing and selling 107,386 93,792 209,764 177,664
Research and development 36,647 32,632 71,746 64,583
General and administrative 25,205 25,290 50,559 50,945
Amortization of intangible assets and acquisition-related costs 2,491 1,748 3,881 3,041
Change in fair value of contingent consideration for business acquisition (2,930) 0 (4,908) 0
Total operating expenses 168,799 153,462 331,042 296,233
Operating income 58,938 53,411 90,363 79,266
Interest income (expense), net 1,048 (90) 2,223 61
Other income (expense), net 459 (683) (570) (1,691)
Income before income taxes 60,445 52,638 92,016 77,636
Provision for (benefit from) income taxes 4,087 5,593 (1,349) 8,650
Net income $ 56,358 $ 47,045 $ 93,365 $ 68,986
Net income per share:        
Net income per share - basic (in dollars per share) | $ / shares $ 0.34 $ 0.29 $ 0.57 $ 0.43
Net income per share - diluted (in dollars per share) | $ / shares $ 0.33 $ 0.28 $ 0.55 $ 0.42
Weighted average shares used to compute net income per share:        
Basic (in shares) | shares 164,120 162,222 163,765 162,176
Diluted (in shares) | shares 169,078 165,549 168,710 164,926
Cash dividend per share (in dollars per share) | (per share) $ 0.63 $ 0.57 $ 0.63 $ 0.57