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Income Taxes (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 30, 2013 | Mar. 31, 2012 | Mar. 26, 2011
Income Taxes [Line Items] |  |  |  |
Decrease in valuation allowance |  | $ 5,800,000 | $ 39,300,000 |
Federal net operating loss carryforwards |  | 177,100,000 |  |
Net operating loss included in deferred tax assets | 105,220,000 | 28,162,000 | 105,220,000 |
Tax effected deferred tax asset |  | 19,900,000 |  |
Excess stock deductions |  | 120,300,000 |  |
Undistributed earnings in non-U.S subsidiaries |  | 228,000 |  |
Unrecognized deferred tax liability |  | 81,000 |  |
Provision (benefit) for income taxes | 39,500,000 | 64,592,000 | (8,000,000) | (119,289,000)
Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss included in deferred tax assets |  | 56,800,000 |  |
Section 382 Of Internal Revenue Code [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss included in deferred tax assets |  | 20,900,000 |  |
Non-U.S [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  | 2,000,000 |  |
State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  | 101,600,000 |  |
Maximum [Member] | Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2033 |  |
Maximum [Member] | State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2029 |  |
Minimum [Member] | Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2019 |  |
Minimum [Member] | State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2014 |  |
Research Tax Credit Carryforward [Member] | Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward |  | 22,500,000 |  |
Provision (benefit) for income taxes |  | (4,200,000) |  |
Research Tax Credit Carryforward [Member] | State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward |  | 14,500,000 |  |
Tax credit carryforward subject to expiration |  | 2,800,000 |  |
Tax credit carryforward not subject to expiration |  | $ 11,700,000 |  |
Research Tax Credit Carryforward [Member] | Maximum [Member] | Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2033 |  |
Research Tax Credit Carryforward [Member] | Maximum [Member] | State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2027 |  |
Research Tax Credit Carryforward [Member] | Minimum [Member] | Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2014 |  |
Research Tax Credit Carryforward [Member] | Minimum [Member] | State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward expirations |  | 2022 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to other deductions received under enacted tax laws not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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