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Segment Information - Segment Revenue, Gross Profit, and Net Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net sales $ 1,186,056 $ 1,116,034 $ 2,333,759 $ 2,204,251
Less: Significant segment expenses        
Cost of goods sold 669,418 627,491 1,336,010 1,247,008
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
Share-based compensation expense 30,312 26,469 63,140 49,874
Interest income (11,828) (14,637) (23,057) (30,427)
Provision for income taxes 32,385 30,583 60,855 56,141
Net income 170,670 145,483 316,685 287,316
Reportable Segment        
Segment Reporting Information [Line Items]        
Net sales 1,186,056 1,116,034 2,333,759 2,204,251
Less: Significant segment expenses        
Cost of goods sold 666,059 623,589 1,330,271 1,240,508
Marketing and selling 186,852 191,394 368,718 376,448
Research and development 70,444 71,138 138,680 140,706
General and administrative 32,656 37,142 64,286 71,383
Share-based compensation expense 30,312 26,469 63,140 49,874
Amortization of intangible assets and acquisition-related costs 4,000 5,177 8,795 10,322
Interest income (11,828) (14,637) (23,057) (30,427)
Other 4,506 (304) 5,386 1,980
Provision for income taxes 32,385 30,583 60,855 56,141
Net income $ 170,670 $ 145,483 $ 316,685 $ 287,316