| Statement of Financial Position, Classified (USD $) | ||
| In Thousands | Dec. 28, 2008
| Jun. 29, 2008
|
| Assets, Current [Abstract] | ||
| Cash and Cash Equivalents, at Carrying Value | $126,217 | $149,221 |
| Marketable Securities, Current | 773,938 | 817,480 |
| Accounts Receivable, Net, Current | 127,833 | 161,452 |
| Allowance for Doubtful Accounts Receivable, Current | 1,752 | 1,752 |
| Inventory, Net [Abstract] | ||
| Inventory, Raw Materials | 4,078 | 4,996 |
| Inventory, Work in Process | 39,616 | 40,028 |
| Inventory, Finished Goods | 11,246 | 10,993 |
| Inventory, Net, Total | 54,940 | 56,017 |
| Deferred Tax Assets, Net, Current | 37,085 | 31,882 |
| Other Assets, Current | 28,368 | 29,488 |
| Assets, Current, Total | 1,148,381 | 1,245,540 |
| Property, Plant and Equipment, Gross [Abstract] | ||
| Land | 51,029 | 51,029 |
| Buildings and Improvements, Gross | 154,805 | 154,418 |
| Machinery and Equipment, Gross | 509,703 | 479,829 |
| Furniture and Fixtures, Gross | 3,773 | 3,694 |
| Property, Plant and Equipment, Gross, Total | 719,310 | 688,970 |
| Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (448,541) | (427,885) |
| Property, Plant and Equipment, Net, Total | 270,769 | 261,085 |
| Other Assets, Noncurrent | 74,388 | 77,264 |
| Assets, Total | 1,493,538 | 1,583,889 |
| Liabilities, Current [Abstract] | ||
| Accounts Payable | 9,274 | 16,860 |
| Employee-related Liabilities | 62,614 | 66,465 |
| Deferred Income on Shipments to Distributors | 31,266 | 37,777 |
| Accrued Income Taxes Payable | 19,385 | 19,839 |
| Other Accrued Liabilities | 34,001 | 34,217 |
| Liabilities, Current, Total | 156,540 | 175,158 |
| Deferred Tax Liabilities, Noncurrent | 53,204 | 41,932 |
| Convertible Debt, Noncurrent | 1,500,000 | 1,700,000 |
| Other Liabilities, Noncurrent | 93,405 | 100,717 |
| Liabilities, Total | 1,803,149 | 2,017,807 |
| Preferred Stock, Par or Stated Value Per Share | 0.001 | 0.001 |
| Preferred Stock, Shares Authorized | 2,000 | 2,000 |
| Preferred Stock, Shares Issued | 0 | 0 |
| Preferred Stock, Shares, Outstanding | 0 | 0 |
| Common Stock, Value | 222 | 221 |
| Common Stock, Par or Stated Value Per Share | 0.001 | 0.001 |
| Common Stock, Shares Authorized | 2,000,000 | 2,000,000 |
| Common Stock, Shares, Issued | 221,762 | 221,508 |
| Common Stock, Shares, Outstanding | 221,762 | 221,508 |
| Additional Paid in Capital | 1,083,514 | 1,050,038 |
| Accumulated Other Comprehensive Income (Loss), Net of Tax | 5,174 | 1,452 |
| Retained Earnings (Accumulated Deficit) | (1,398,521) | (1,485,629) |
| Stockholders' Equity, Total | (309,611) | (433,918) |
| Liabilities and Stockholders' Equity, Total | $1,493,538 | $1,583,889 |
| Statement of Income (Including Gross Margin) (USD $) | ||||
| In Thousands | 3 Months Ended
Dec. 28, 2008 | 3 Months Ended
Dec. 30, 2007 | 6 Months Ended
Dec. 28, 2008 | 6 Months Ended
Dec. 30, 2007 |
| Gross Profit [Abstract] | ||||
| Sales Revenue, Net | $249,196 | $288,720 | $559,547 | $570,208 |
| Cost of Revenue | 60,278 | 66,212 | 131,750 | 130,273 |
| Gross Profit, Total | 188,918 | 222,508 | 427,797 | 439,935 |
| Operating Expenses [Abstract] | ||||
| Research and Development Expense | 45,793 | 47,799 | 96,653 | 95,579 |
| Selling, General and Administrative Expense | 32,573 | 33,557 | 69,680 | 66,338 |
| Restructuring Charges | 1,564 | 0 | 1,564 | 0 |
| Operating Expenses, Total | 79,930 | 81,356 | 167,897 | 161,917 |
| Operating Income (Loss), Total | 108,988 | 141,152 | 259,900 | 278,018 |
| Interest Expense | (13,246) | (14,474) | (27,653) | (28,936) |
| Investment Income, Interest | 6,113 | 7,258 | 13,087 | 13,692 |
| Gains (Losses) on Extinguishment of Debt | 20,989 | 0 | 20,989 | 0 |
| Income (Loss) from Continuing Operations before Income Taxes, Minority Interest, and Income (Loss) from Equity Method Investments, Total | 122,844 | 133,936 | 266,323 | 262,774 |
| Income Tax Expense (Benefit) | 27,640 | 40,181 | 63,510 | 77,544 |
| Net Income (Loss), Total | $95,204 | $93,755 | $202,813 | $185,230 |
| Earnings Per Share, Basic [Abstract] | ||||
| Earnings Per Share, Basic | 0.43 | 0.42 | 0.92 | 0.83 |
| Weighted Average Number of Shares Outstanding, Basic | 221,563 | 223,494 | 221,516 | 223,137 |
| Earnings Per Share, Diluted [Abstract] | ||||
| Earnings Per Share, Diluted | 0.43 | 0.41 | 0.91 | 0.81 |
| Weighted Average Number of Diluted Shares Outstanding | 221,657 | 227,119 | 222,133 | 227,687 |
| Common Stock, Dividends, Per Share, Cash Paid | 0.21 | 0.18 | 0.42 | 0.36 |
| Statement of Cash Flows (USD $) | ||
| In Thousands | 6 Months Ended
Dec. 28, 2008 | 6 Months Ended
Dec. 30, 2007 |
| Net Cash Provided by (Used in) Operating Activities [Abstract] | ||
| Net Income (Loss) | $202,813 | $185,230 |
| Adjustments to Reconcile Income (Loss) to Net Cash Provided by (Used in) Continuing Operations [Abstract] | ||
| Depreciation and Amortization | 23,968 | 24,761 |
| Tax Benefit from Stock Options Exercised | (1,141) | 5,407 |
| Share-based Compensation | 29,138 | 28,626 |
| Gains (Losses) on Extinguishment of Debt | 20,989 | 0 |
| Increase (Decrease) in Operating Capital [Abstract] | ||
| Increase (Decrease) in Accounts Receivable | 33,619 | (19,469) |
| Increase (Decrease) in Inventories | 1,077 | (1,411) |
| Increase (Decrease) in Prepaid, Deferred Expense and Other Assets | 6,277 | 691 |
| Increase (Decrease) in Other Operating Assets | 3,512 | (1,546) |
| Increase (Decrease) in Accounts Payable and Accrued Liabilities | (17,681) | 6,390 |
| (Decrease) Increase in Deferred Income on Shipments to Distributors | (6,511) | (1,663) |
| Increase (Decrease) in Accrued Income Taxes Payable | (6,830) | 27,765 |
| Increase (Decrease) in Other Operating Liabilities | (5) | 470 |
| Net Cash Provided by (Used in) Operating Activities, Total | 247,247 | 255,251 |
| Net Cash Provided by (Used in) Investing Activities [Abstract] | ||
| Proceeds from Sale and Maturity of Other Investments | 300,779 | 365,565 |
| Payments to Acquire Marketable Securities | (251,238) | (528,717) |
| Payments to Acquire Property, Plant, and Equipment | (30,556) | (11,358) |
| Net Cash Provided by (Used in) Investing Activities, Total | 18,985 | (174,510) |
| Net Cash Provided by (Used in) Financing Activities [Abstract] | ||
| Repayments of Convertible Debt | (179,011) | 0 |
| Excess Tax Benefit from Share-based Compensation, Financing Activities | 70 | 8,527 |
| Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans | 9,290 | 39,424 |
| Payments for Repurchase of Common Stock | (24,711) | (40,945) |
| Payments of Dividends | (94,874) | (81,721) |
| Net Cash Provided by (Used in) Financing Activities, Total | (289,236) | (74,715) |
| Cash and Cash Equivalents, Period Increase (Decrease), Total | (23,004) | 6,026 |
| Cash and Cash Equivalents, at Carrying Value, Beginning Balance | 149,221 | 156,494 |
| Cash and Cash Equivalents, at Carrying Value, Ending Balance | $126,217 | $162,520 |
| Document Information (LLTCQ2FY09 [Member]) | |
| 3 Months Ended
Dec. 28, 2008 | |
| Document Information [Line Items] | |
| Document Type | 10-Q |
| Amendment Flag | true |
| Amendment Description | XBRL tables |
| Document Period End Date | 2008-12-28 |
| Entity Information (LLTC [Member], USD $) | ||
| 3 Months Ended
Dec. 28, 2008 | Jan. 23, 2009
| |
| Entity Information [Line Items] | ||
| Entity Registrant Name | Linear Technology Coporation | |
| Entity Central Index Key | 0000791907 | |
| Entity Tax Identification Number | 942778785 | |
| Current Fiscal Year End Date | --06-28 | |
| Entity Well-known Seasoned Issuer | Yes | |
| Entity Voluntary Filers | No | |
| Entity Current Reporting Status | Yes | |
| Entity Filer Category | Large Accelerated Filer | |
| Entity Public Float | $4,781,189,000 | |
| Entity Common Stock, Shares Outstanding | 221,859,138 |
