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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:      
Net income $ 644,513,000 $ 947,257,000 $ 449,723,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 88,361,000 50,752,000 42,893,000
Amortization of intangible assets 30,179,000 31,818,000 30,858,000
Impairment of intangible assets 7,000,000 0 0
Loss on investments 1,683,000 3,899,000 756,000
Investment impairment 0 2,011,000 0
Share-based compensation expense 93,479,000 86,019,000 54,870,000
Deferred income taxes 27,334,000 34,484,000 (159,853,000)
Change in fair value of contingent consideration for business acquisition (3,509,000) 5,716,000 23,247,000
Gain on sale of investment in a privately held company 0 0 (39,767,000)
Other 1,140,000 (1,784,000) (936,000)
Changes in assets and liabilities, net of acquisitions:      
Accounts receivable, net (71,510,000) (201,220,000) (15,768,000)
Inventories (276,640,000) (427,501,000) 60,388,000
Other assets (18,169,000) (67,708,000) 18,319,000
Accounts payable (181,303,000) 553,960,000 (24,250,000)
Accrued and other liabilities (44,240,000) 440,935,000 (15,480,000)
Net cash provided by operating activities 298,318,000 1,458,638,000 425,000,000
Cash flows from investing activities:      
Purchases of property, plant and equipment (89,152,000) (76,189,000) (39,484,000)
Investment in privately held companies (1,463,000) (4,115,000) (345,000)
Acquisitions, net of cash acquired (16,236,000) (43,523,000) (91,569,000)
Proceeds from return of strategic investments 0 2,934,000 0
Purchases of short-term investments (10,000,000) 0 0
Proceeds from the sale of short-term investments 8,260,000 0 0
Proceeds from sale of property, plant and equipment 0 0 1,037,000
Purchases of deferred compensation investments (5,058,000) (12,336,000) (11,964,000)
Proceeds from sales of deferred compensation investments 5,786,000 13,247,000 12,091,000
Net cash used in investing activities (107,863,000) (119,982,000) (130,234,000)
Cash flows from financing activities:      
Payment of cash dividends (159,410,000) (146,705,000) (124,180,000)
Payment of contingent consideration for business acquisition (880,000) 0 0
Purchases of registered shares (412,022,000) (164,952,000) (50,437,000)
Proceeds from exercises of stock options and purchase rights 29,649,000 43,810,000 22,241,000
Tax withholdings related to net share settlements of restricted stock units (64,156,000) (32,082,000) (24,280,000)
Net cash used in financing activities (606,819,000) (299,929,000) (176,656,000)
Effect of exchange rate changes on cash and cash equivalents (5,247,000) (3,966,000) (7,060,000)
Net increase (decrease) in cash and cash equivalents (421,611,000) 1,034,761,000 111,050,000
Cash and cash equivalents at beginning of the period 1,750,327,000 715,566,000 604,516,000
Cash and cash equivalents at end of the period 1,328,716,000 1,750,327,000 715,566,000
Non-cash investing and financing activities:      
Property, plant and equipment purchased during the period and included in period end liability accounts 11,890,000 16,819,000 5,021,000
Non-cash contingent consideration for acquisition 292,000 28,463,000 0
Equity and debt investment in a privately held company 0 0 42,350,000
Fair value of contingent consideration in accrued and other liabilities 9,013,000 0 0
Supplemental cash flow information:      
Income taxes paid, net $ 192,898,000 $ 23,041,000 $ 20,851,000