CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 112,301us-gaap_NetIncomeLoss	$ 112,417us-gaap_NetIncomeLoss	$ 106,402us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,711	15,566	16,219
Stock-based compensation	28,594us-gaap_ShareBasedCompensation	23,180us-gaap_ShareBasedCompensation	18,350us-gaap_ShareBasedCompensation
Excess tax benefit from stock-based compensation	(3,520)	(4,659)	(2,722)
Deferred income taxes	(980)us-gaap_DeferredIncomeTaxExpenseBenefit	(5,813)us-gaap_DeferredIncomeTaxExpenseBenefit	984us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for excess and obsolete inventories	931us-gaap_InventoryWriteDown	4,138us-gaap_InventoryWriteDown	1,576us-gaap_InventoryWriteDown
Other operating activities	(1,188)us-gaap_OtherNoncashIncomeExpense	1,983us-gaap_OtherNoncashIncomeExpense	2,249us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, net of effect of acquisition:
Accounts receivable, net	4,272	(11,136)	(16,335)
Inventory, net	128us-gaap_IncreaseDecreaseInInventories	6,040us-gaap_IncreaseDecreaseInInventories	(14,811)us-gaap_IncreaseDecreaseInInventories
Current and other assets	(5,368)	1,355	(6,056)
Accounts payable	(62)	(6,311)	2,778
Accrued liabilities	500	(418)	9,641
Income taxes	119	5,149	7,226
Cash provided by operating activities	154,438	141,491	125,501
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sales of investments	96,129	102,414	56,471
Proceeds from maturities of investments	120,430	137,955	184,115
Purchase of investments	(216,013)	(247,355)	(258,278)
Acquisition, net of cash acquired	(150)	0	(1,926)
Capital expenditures and other assets	(21,962)	(50,985)	(39,310)
Cash used for investing activities	(21,566)	(57,971)	(58,928)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(112,939)	(85,654)	(23,931)
Employees' tax withheld and paid for restricted stock and restricted stock units	(7,611)	(6,222)	(3,047)
Proceeds from issuances under stock-based compensation plans	23,042	24,055	31,865
Payment of cash dividends	(25,730)us-gaap_PaymentsOfDividendsCommonStock	(17,372)us-gaap_PaymentsOfDividendsCommonStock	(17,072)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from revolving line of credit	34,500	0	18,000
Repayments of revolving line of credit	0	0	(55,000)
Excess tax benefit from stock-based compensation	3,520	4,659	2,722
Cash used for financing activities	(85,218)	(80,534)	(46,463)
Effect of exchange rate changes on cash and cash equivalents	(3,508)	942	(669)
Net increase in cash and cash equivalents	44,146	3,928	19,441
Cash and cash equivalents at beginning of year	232,704	228,776	209,335
Cash and cash equivalents at end of year	276,850	232,704	228,776
SUPPLEMENTAL DISCLOSURES
Cash paid for income taxes	33,804us-gaap_IncomeTaxesPaid	31,021us-gaap_IncomeTaxesPaid	29,953us-gaap_IncomeTaxesPaid
Non-cash investing activity - purchases of property, plant, and equipment for which payment has not yet been made	$ 2,087	$ 0	$ 0

Employees' taxes withheld and paid for restricted stock and restricted stock units.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The cash inflow 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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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.

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-Section 45

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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.

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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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