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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]      
Net sales $ 2,788,322 $ 2,566,863 $ 2,221,427
Cost of goods sold 1,737,969 1,648,744 1,395,211
Amortization of intangible assets and purchase accounting effect on inventory 13,342 8,878 6,175
Gross profit 1,037,011 909,241 820,041
Operating expenses:      
Marketing and selling 488,263 435,489 379,641
Research and development 161,230 143,760 130,525
General and administrative 98,732 96,353 100,270
Amortization of intangible assets and acquisition-related costs 14,290 8,930 5,814
Change in fair value of contingent consideration for business acquisition 0 (4,908) (8,092)
Restructuring charges (credits), net 11,302 (116) 23
Total operating expenses 773,817 679,508 608,181
Operating income 263,194 229,733 211,860
Interest income 8,375 4,969 1,452
Other income (expense), net (436) (2,437) 1,677
Income before income taxes 271,133 232,265 214,989
Provision for income taxes 13,560 23,723 9,113
Net income $ 257,573 $ 208,542 $ 205,876
Net income per share:      
Basic (in dollars per share) $ 1.56 $ 1.27 $ 1.27
Diluted (in dollars per share) $ 1.52 $ 1.23 $ 1.24
Weighted average shares used to compute net income per share:      
Basic (in shares) 165,609 164,038 162,058
Diluted (in shares) 168,965 168,971 165,540