Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Cash flows from operating activities:
Net income	$ 28,012us-gaap_NetIncomeLoss	$ 25,078us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,981us-gaap_Depreciation	7,066us-gaap_Depreciation
Amortization	2,890us-gaap_AdjustmentForAmortization	3,197us-gaap_AdjustmentForAmortization
Stock-based compensation	5,949us-gaap_ShareBasedCompensation	5,139us-gaap_ShareBasedCompensation
Other	(133)us-gaap_OtherNoncashIncomeExpense	0us-gaap_OtherNoncashIncomeExpense
Income taxes payable (receivable), net	2,148	(2,898)
Deferred income taxes	(2,099)us-gaap_DeferredIncomeTaxExpenseBenefit	1,455us-gaap_DeferredIncomeTaxExpenseBenefit
Decrease (increase), net of acquisitions, in:
Receivables, net	(14,386)us-gaap_IncreaseDecreaseInReceivables	(10,760)us-gaap_IncreaseDecreaseInReceivables
Inventories	(3,876)us-gaap_IncreaseDecreaseInInventories	(10,930)us-gaap_IncreaseDecreaseInInventories
Other assets	2,185	4,196
Increase (decrease), net of acquisitions, in:
Accounts payable	(783)	12,542
Accrued payroll liabilities	(6,313)	(13,725)
Accrued warranty reserves	496	545
Deferred revenue	9,381	4,004
Accrued restructuring, reorganization, relocation and severance	(4,958)	773
Other liabilities	(1,370)	2,767
Net cash provided by operating activities	23,124	28,449
Cash flows from investing activities:
Decrease in restricted cash	2,372	1,907
Acquisition of property, plant and equipment	(5,192)	(4,336)
Payments for acquisitions, net of cash acquired	(5,377)	(64,615)
Purchase of investments in marketable securities	(44,240)	(75,100)
Redemption of investments in marketable securities	36,619	49,374
Other	(68)	(268)
Net cash used in investing activities	(15,886)	(93,038)
Cash flows from financing activities:
Dividends paid on common stock	(10,450)us-gaap_PaymentsOfDividendsCommonStock	(5,058)us-gaap_PaymentsOfDividendsCommonStock
Withholding taxes paid on issuance of vested restricted stock units	(1,114)feic_SharesWithheldForEmployeeTaxes	(955)feic_SharesWithheldForEmployeeTaxes
Proceeds from exercise of stock options and employee stock purchases	3,705	5,504
Excess tax benefit for share based payment arrangements	431	1,866
Repurchases of common stock	(8,296)	0
Net cash (used in) provided by financing activities	(15,724)	1,357
Effect of exchange rate changes	(23,765)	(3,272)
Decrease in cash and cash equivalents	(32,251)	(66,504)
Cash and cash equivalents:
Beginning of period	300,507	384,170
End of period	268,256	317,666
Supplemental Cash Flow Information:
Cash paid for income taxes, net	5,942us-gaap_IncomeTaxesPaidNet	3,711us-gaap_IncomeTaxesPaidNet
Cash paid for interest	59us-gaap_InterestPaid	63us-gaap_InterestPaid
Decrease in fixed assets related to transfers with inventories	(901)	(240)
Dividends declared but not paid	10,450	5,056
Accrued purchases of plant and equipment	398	8,345
Accrued repurchases of common stock	$ 1,785feic_Accruedrepurchasesofcommonstock	$ 0feic_Accruedrepurchasesofcommonstock

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