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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:      
Net income $ 449,723 $ 257,573 $ 208,542
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 42,893 43,471 41,295
Amortization of intangible assets 30,858 24,180 15,607
Share-based compensation expense 54,870 50,265 44,138
Loss (gain) on investments 756 (816) (669)
Deferred income taxes (159,853) (12,257) 7,141
Change in fair value of contingent consideration for business acquisition 23,247 0 (4,908)
Other (936) (230) (11)
Gain on sale of investment in a privately held company (39,767) 0 0
Changes in assets and liabilities, net of acquisitions:      
Accounts receivable, net (15,768) (58,798) (26,363)
Inventories 60,388 (21,551) 16,047
Other assets 18,319 (8,800) (16,908)
Accounts payable (24,250) (19,134) 17,695
Accrued and other liabilities (15,480) 51,278 44,655
Net cash provided by operating activities 425,000 305,181 346,261
Cash flows from investing activities:      
Purchases of property, plant and equipment (39,484) (35,930) (39,748)
Investment in privately held companies (345) (2,717) (1,240)
Acquisitions, net of cash acquired (91,569) (133,814) (88,323)
Proceeds from return of investments 0 124 237
Purchases of short-term investments 0 (1,505) (6,789)
Sales of short-term investments 0 0 6,789
Proceeds from sale of property, plant and equipment 1,037 0 0
Purchases of trading investments (11,964) (5,203) (6,053)
Proceeds from sales of trading investments 12,091 5,700 6,423
Net cash used in investing activities (130,234) (173,345) (128,704)
Cash flows from financing activities:      
Payment of cash dividends (124,180) (113,971) (104,248)
Purchases of registered shares (50,437) (32,449) (30,722)
Payment of contingent consideration for business acquisition 0 0 (5,000)
Proceeds from exercises of stock options and purchase rights 22,241 18,057 41,910
Tax withholdings related to net share settlements of restricted stock units (24,280) (30,770) (29,813)
Net cash used in financing activities (176,656) (159,133) (127,873)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (7,060) (10,134) 4,730
Net increase (decrease) in cash, cash equivalents and restricted cash 111,050 (37,431) 94,414
Cash, cash equivalents and restricted cash at beginning of the period 604,516 641,947 547,533
Cash, cash equivalents and restricted cash at end of the period 715,566 604,516 641,947
Non-cash investing activities:      
Property, plant and equipment purchased during the period and included in period end liability accounts 5,021 3,983 3,869
Equity and debt investment in a privately held company 42,350 0 0
Supplemental cash flow information:      
Income taxes paid, net $ 20,851 $ 15,312 $ 15,051