Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 26, 2014	Oct. 27, 2013
Cash flows from operating activities:
Net income	$ 43,388	$ 46,342
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	36,247	42,386
Effect of acquisition fair value adjustments	0	2,529
Accretion of deferred financing costs and debt discount	789	1,255
Write off deferred financing costs & debt discount	0	7,093
Deferred income taxes	6,519	(7,814)
Stock-based compensation	21,056	21,610
Gain on disposition of property, plant and equipment	0	(28)
Changes in assets and liabilities:
Accounts receivable, net	(11,990)	(4,986)
Inventories	(44)	294
Prepaid expenses and other assets	(1,804)	(3,008)
Accounts payable	(94)	(12,513)
Accrued liabilities	697	(12,707)
Deferred revenue	592	3,674
Income taxes payable and prepaid taxes	(2,095)	(2,638)
Other liabilities	1,268	5,895
Net cash provided by operating activities	94,529	87,384
Cash flows from investing activities:
Purchases of available-for-sale investments	0	(1,050)
Proceeds from sales and maturities of available-for-sale investments	3,124	9,499
Proceeds from sales of property, plant and equipment	71	57
Purchase of property, plant and equipment	(25,459)	(30,750)
Purchase of intangible assets	(1,000)	(2,583)
Purchase of cost method investment	(3,648)	0
Net cash used in investing activities	(26,912)	(24,827)
Cash flows from financing activities:
Proceeds of debt issue, net of discount	0	327,344
Deferred financing cost	0	(2,980)
Payment for employee stock-based compensation payroll taxes	(6,309)	(8,657)
Proceeds from exercises of stock options	7,952	14,750
Repurchase of outstanding common stock	(40,906)	(15,000)
Payment of long term debt	(39,062)	(363,813)
Net cash used in financing activities	(78,325)	(48,356)
Net (decrease) increase in cash and cash equivalents	(10,708)	14,201
Cash and cash equivalents at beginning of period	243,194	223,192
Cash and cash equivalents at end of period	$ 232,486	$ 237,393