CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,306,267	$ 1,257,158	$ 2,618,325	$ 2,049,052
Cost of goods sold	760,268	684,599	1,499,334	1,167,237
Amortization of intangible assets	3,836	2,836	7,902	6,359
Gross profit	542,163	569,723	1,111,089	875,456
Operating expenses:
Marketing and selling	256,627	158,797	508,941	292,035
Research and development	68,661	53,379	137,907	103,104
General and administrative	33,271	31,664	73,813	60,735
Amortization of intangible assets and acquisition-related costs	5,107	4,331	10,324	8,940
Change in fair value of contingent consideration for business acquisition	(925)	0	(2,399)	5,716
Restructuring charges (credits), net	11	(1)	11	(54)
Total operating expenses	362,752	248,170	728,597	470,476
Operating income	179,411	321,553	382,492	404,980
Interest income	201	513	517	1,133
Other income (expense), net	(6,703)	1,149	1,732	3,178
Income before income taxes	172,909	323,215	384,741	409,291
Provision for income taxes	33,453	56,301	58,444	70,304
Net income	$ 139,456	$ 266,914	$ 326,297	$ 338,987
Net income per share:
Basic (in dollars per share)	$ 0.83	$ 1.58	$ 1.94	$ 2.02
Diluted (in dollars per share)	$ 0.81	$ 1.56	$ 1.90	$ 1.99
Weighted average shares used to compute net income per share:
Basic (in shares)	168,389	168,645	168,380	168,140
Diluted (in shares)	171,343	171,382	171,682	170,766