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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]        
Net sales $ 864,388 $ 812,021 $ 2,164,014 $ 1,974,437
Cost of goods sold 535,707 533,631 1,349,941 1,271,127
Amortization of intangible assets and purchase accounting effect on inventory 4,699 2,789 10,037 6,304
Gross profit 323,982 275,601 804,036 697,006
Operating expenses:        
Marketing and selling 132,250 116,153 368,635 325,917
Research and development 40,591 34,398 119,120 106,144
General and administrative 24,496 22,291 75,175 72,966
Amortization of intangible assets and acquisition-related costs 3,539 2,496 10,377 6,377
Change in fair value of contingent consideration for business acquisition 0 0 0 (4,908)
Restructuring charges (credits), net (278) 0 9,762 (116)
Total operating expenses 200,598 175,338 583,069 506,380
Operating income 123,384 100,263 220,967 190,626
Interest income 1,482 874 5,709 3,097
Other expense, net (2,747) (324) (929) (894)
Income before income taxes 122,119 100,813 225,747 192,829
Provision for income taxes 9,309 20,040 10,295 18,691
Net income $ 112,810 $ 80,773 $ 215,452 $ 174,138
Net income per share:        
Net income per share - basic (in dollars per share) $ 0.68 $ 0.49 $ 1.30 $ 1.06
Net income per share - diluted (in dollars per share) $ 0.67 $ 0.48 $ 1.28 $ 1.03
Weighted average shares used to compute net income per share:        
Basic (in shares) 165,707 164,248 165,552 163,924
Diluted (in shares) 168,907 169,079 168,966 168,832