CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 257,573	$ 208,542	$ 205,876
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	43,471	41,295	41,121
Amortization of intangible assets	24,180	15,607	9,367
Share-based compensation expense	50,265	44,138	35,890
Gain on investments	(816)	(669)	(569)
Deferred income taxes	(12,257)	7,141	(2,397)
Change in fair value of contingent consideration for business acquisition	0	(4,908)	(8,092)
Other	(230)	(11)	107
Changes in assets and liabilities, net of acquisitions:
Accounts receivable, net	(58,798)	(26,363)	(46,553)
Inventories	(21,551)	16,047	(15,428)
Other assets	(8,800)	(16,908)	(5,309)
Accounts payable	(19,134)	17,695	24,459
Accrued and other liabilities	51,278	44,655	49,917
Net cash provided by operating activities	305,181	346,261	288,389
Cash flows from investing activities:
Purchases of property, plant and equipment	(35,930)	(39,748)	(31,804)
Investment in privately held companies	(2,717)	(1,240)	(960)
Acquisitions, net of cash acquired	(133,814)	(88,323)	(66,987)
Proceeds from return of investments	124	237	0
Purchases of short-term investments	(1,505)	(6,789)	0
Purchases of trading investments	0	6,789	0
Purchases of trading investments	(5,203)	(6,053)	(7,052)
Proceeds from sales of trading investments	5,700	6,423	7,124
Net cash used in investing activities	(173,345)	(128,704)	(99,679)
Cash flows from financing activities:
Payment of cash dividends	(113,971)	(104,248)	(93,093)
Purchases of registered shares	(32,449)	(30,722)	(83,786)
Payment of contingent consideration for business acquisition	0	(5,000)	0
Proceeds from exercises of stock options and purchase rights	18,057	41,910	39,574
Tax withholdings related to net share settlements of restricted stock units	(30,770)	(29,813)	(18,412)
Net cash used in financing activities	(159,133)	(127,873)	(155,717)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(10,134)	4,730	(5,370)
Net increase (decrease) in cash, cash equivalents and restricted cash	(37,431)	94,414	27,623
Cash, cash equivalents and restricted cash at beginning of the period	641,947	547,533	519,910
Cash, cash equivalents and restricted cash at end of the period	604,516	641,947	547,533
Non-cash investing activities:
Property, plant and equipment purchased during the period and included in period end liability accounts	3,983	3,869	5,072
Supplemental cash flow information:
Income taxes paid, net	$ 15,312	$ 15,051	$ 11,323

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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- Definition

The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

+ Details

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- Definition

The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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- Definition

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

No definition available.

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- References

No definition available.

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