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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:      
Net income $ 947,257,000 $ 449,723,000 $ 257,573,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 50,752,000 42,893,000 43,471,000
Amortization of intangible assets 31,818,000 30,858,000 24,180,000
Investment impairment 2,011,000 0 0
Share-based compensation expense 86,019,000 54,870,000 50,265,000
Loss (gain) on investments 3,899,000 756,000 (816,000)
Deferred income taxes 34,484,000 (159,853,000) (12,257,000)
Change in fair value of contingent consideration for business acquisition 5,716,000 23,247,000 0
Gain on sale of investment in a privately held company 0 (39,767,000) 0
Other (1,784,000) (936,000) (230,000)
Changes in assets and liabilities, net of acquisitions:      
Accounts receivable, net (201,220,000) (15,768,000) (58,798,000)
Inventories (427,501,000) 60,388,000 (21,551,000)
Other assets (67,708,000) 18,319,000 (8,800,000)
Accounts payable 553,960,000 (24,250,000) (19,134,000)
Accrued and other liabilities 440,935,000 (15,480,000) 51,278,000
Net cash provided by operating activities 1,458,638,000 425,000,000 305,181,000
Cash flows from investing activities:      
Purchases of property, plant and equipment (76,189,000) (39,484,000) (35,930,000)
Investment in privately held companies (4,115,000) (345,000) (2,717,000)
Acquisitions, net of cash acquired (43,523,000) (91,569,000) (133,814,000)
Proceeds from return of strategic investments 2,934,000 0 124,000
Purchases of short-term investments 0 0 (1,505,000)
Proceeds from sale of property, plant and equipment 0 1,037,000 0
Purchases of trading investments (12,336,000) (11,964,000) (5,203,000)
Proceeds from sales of trading investments 13,247,000 12,091,000 5,700,000
Net cash used in investing activities (119,982,000) (130,234,000) (173,345,000)
Cash flows from financing activities:      
Payment of cash dividends (146,705,000) (124,180,000) (113,971,000)
Purchases of registered shares (164,952,000) (50,437,000) (32,449,000)
Proceeds from exercises of stock options and purchase rights 43,810,000 22,241,000 18,057,000
Tax withholdings related to net share settlements of restricted stock units (32,082,000) (24,280,000) (30,770,000)
Net cash used in financing activities (299,929,000) (176,656,000) (159,133,000)
Effect of exchange rate changes on cash, cash equivalents (3,966,000) (7,060,000) (10,134,000)
Net increase (decrease) in cash, cash equivalents 1,034,761,000 111,050,000 (37,431,000)
Cash, cash equivalents at beginning of the period 715,566,000 604,516,000 641,947,000
Cash, cash equivalents at end of the period 1,750,327,000 715,566,000 604,516,000
Non-cash investing and financing activities:      
Property, plant and equipment purchased during the period and included in period end liability accounts 16,819,000 5,021,000 3,983,000
Non-cash contingent consideration for acquisition 28,463,000 0 0
Equity and debt investment in a privately held company 0 42,350,000 0
Supplemental cash flow information:      
Income taxes paid, net $ 23,041,000 $ 20,851,000 $ 15,312,000