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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Net sales $ 1,186,056 $ 1,116,034 $ 2,333,759 $ 2,204,251
Cost of goods sold 669,418 627,491 1,336,010 1,247,008
Amortization of intangible assets 2,182 2,452 4,331 4,894
Gross profit 514,456 486,091 993,418 952,349
Operating expenses:        
Marketing and selling 198,993 201,863 394,789 398,768
Research and development 76,110 76,205 150,697 151,512
General and administrative 41,802 44,173 83,599 81,631
Amortization of intangible assets and acquisition-related costs 1,818 2,725 4,464 5,428
Restructuring charges, net 4,442 229 6,484 615
Total operating expenses 323,165 325,195 640,033 637,954
Operating income 191,291 160,896 353,385 314,395
Interest income 11,828 14,637 23,057 30,427
Other income (expense), net (64) 533 1,098 (1,365)
Income before income taxes 203,055 176,066 377,540 343,457
Provision for income taxes 32,385 30,583 60,855 56,141
Net income $ 170,670 $ 145,483 $ 316,685 $ 287,316
Net income per share:        
Basic (in dollars per share) $ 1.16 $ 0.95 $ 2.15 $ 1.88
Diluted (in dollars per share) $ 1.15 $ 0.95 $ 2.13 $ 1.86
Weighted average shares used to compute net income per share:        
Basic (in shares) 147,123 152,460 147,487 152,875
Diluted (in shares) 148,422 153,672 148,731 154,320