Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Cash flows from operating activities:
Net income (loss)	$ 27,947us-gaap_ProfitLoss	$ (164,466)us-gaap_ProfitLoss	$ 41,939us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	69,303	94,073	49,192
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	116,686us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Effect of acquisition fair value adjustments	(929)	2,529	37,693
Accretion of deferred financing costs and debt discount	1,083	1,509	2,545
Write-off of deferred financing costs and debt discount	0smtc_LossGainonModificationofDebt	7,093smtc_LossGainonModificationofDebt	0smtc_LossGainonModificationofDebt
Deferred income taxes	27	29,987	(47,623)
Stock-based compensation	29,629us-gaap_ShareBasedCompensation	24,589us-gaap_ShareBasedCompensation	24,528us-gaap_ShareBasedCompensation
Excess tax benefits on stock based compensation	(13)	(4,220)	0
Loss (gain) on disposition of property, plant and equipment	74	(28)	85
Changes in assets and liabilities:
Accounts receivable, net	(2,968)	2,827	(5,002)
Inventories	(13,290)us-gaap_IncreaseDecreaseInInventories	12,238us-gaap_IncreaseDecreaseInInventories	(4,251)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(5,902)	623	5,971
Accounts payable	(9,077)	(11,294)	4,453
Accrued liabilities	2,497	(2,739)	(10,410)
Deferred revenue	(1,419)	3,401	(1,112)
Income taxes payable and prepaid taxes	2,477	1,825	(1,120)
Other liabilities	6,721	3,348	5,080
Net cash provided by operating activities	106,160	117,981	101,968
Cash flows from investing activities:
Purchases of available-for-sale investments	0us-gaap_PaymentsToAcquireInvestments	(1,050)us-gaap_PaymentsToAcquireInvestments	(24,744)us-gaap_PaymentsToAcquireInvestments
Proceeds from sales and maturities of available-for-sale investments	3,674	10,249	112,466
Proceeds from sales of property, plant and equipment	89	57	0
Purchase of property, plant and equipment	(31,755)	(37,161)	(23,266)
Purchase of intangible assets	(1,100)	(3,533)	(1,251)
Purchase of cost method investment	(7,148)	(2,500)	(2,500)
Acquisitions, net of cash acquired	(4,852)	0	(491,717)
Net cash used in investing activities	(41,092)	(33,938)	(431,012)
Cash flows from financing activities:
Proceeds from debt issuance, net of discount	5,000	327,344	347,000
Deferred financing cost	0us-gaap_PaymentsOfFinancingCosts	(2,980)us-gaap_PaymentsOfFinancingCosts	(8,962)us-gaap_PaymentsOfFinancingCosts
Payment for interest rate cap	0	0	(1,100)
Excess tax benefits on stock based compensation	13	4,220	0
Payments for employee stock-based compensation payroll taxes	(7,172)	(10,522)	(6,894)
Proceeds from exercises of stock options	8,880	16,398	19,749
Repurchase of outstanding common stock	(40,906)	(30,000)	(7,769)
Payment of long term debt	(43,749)us-gaap_RepaymentsOfLongTermDebt	(368,501)us-gaap_RepaymentsOfLongTermDebt	(16,875)us-gaap_RepaymentsOfLongTermDebt
Net cash (used in) provided by financing activities	(77,934)	(64,041)	325,149
Effect of exchange rate increase on cash and cash equivalents	0	0	65
Net (decrease) increase in cash and cash equivalents	(12,866)	20,002	(3,830)
Cash and cash equivalents at beginning of period	243,194	223,192	227,022
Cash and cash equivalents at end of period	230,328	243,194	223,192
Supplemental disclosure of cash flow information
Income taxes paid	4,399us-gaap_IncomeTaxesPaid	7,227us-gaap_IncomeTaxesPaid	5,029us-gaap_IncomeTaxesPaid
Interest paid	$ 5,441us-gaap_InterestPaid	$ 8,727us-gaap_InterestPaid	$ 10,556us-gaap_InterestPaid

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