CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 20,387	$ 21,228
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,146	4,986
Amortization of debt issuance costs	362	121
Stock-based compensation	8,413	8,050
Excess tax benefit from stock-based compensation	(339)	(2,391)
Deferred income taxes	4,890	4,146
Provision for excess and obsolete inventories	772	402
Restructuring charges	(1,048)	0
Cash payments for restructuring charges	(2,788)	0
Other operating activities	(1,920)	4,537
Changes in assets and liabilities, net of effect of acquisition:
Accounts receivable, net	(4,529)	8,579
Inventory, net	(1,486)	358
Current and other assets	(672)	(2,869)
Accounts payable	7,055	4,958
Accrued liabilities	(1,370)	(6,212)
Income taxes	(2,736)	(2,419)
Cash provided by operating activities	30,137	43,474
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sales of investments	74,349	16,375
Proceeds from maturities of investments	34,353	25,425
Purchase of investments	(106,711)	(43,834)
Capital expenditures	(7,579)	(3,966)
Cash used for investing activities	(5,588)	(6,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(18,639)	(284,444)
Employees' tax withheld and paid for restricted stock and restricted stock units	(8,792)	(9,903)
Proceeds from issuances under stock-based compensation plans	733	3,077
Proceeds from revolving line of credit	0	155,749
Repayments of revolving line of credit	0	(190,249)
Proceeds from bonds issuance, net of issuance costs	0	489,670
Payment of cash dividends	(4,970)	(5,828)
Excess tax benefit from stock-based compensation	339	2,391
Cash provided by (used for) financing activities	(31,329)	160,463
Effect of exchange rate changes on cash and cash equivalents	(1,013)	592
Net increase (decrease) in cash and cash equivalents	(7,793)	198,529
Cash and cash equivalents at beginning of period	235,266	276,850
Cash and cash equivalents at end of period	$ 227,473	$ 475,379

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- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
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-Publisher FASB
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-Topic 320
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-Section 45
-Paragraph 11
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
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-Section 45
-Paragraph 28
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 420
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-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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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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