2.2.0.25falsefalse1110 - Disclosure - Income Taxestruefalsefalse1falsefalseUSDfalsefalse1/2/2011 - 4/2/2011 USD ($) USD ($) / shares $D2011Q1http://www.sec.gov/CIK0000350907duration2011-01-02T00:00:002011-04-02T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0thor_IncomeTaxesDisclosureAbstractthorfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseIncome Taxes3false0us-gaap_IncomeTaxDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00<table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> 11. Income Taxes   Our effective income tax rates for the three months ended April 2, 2011 and April 3, 2010, were 34.1% and 33.8%, respectively.  Fluctuations in our reported income tax rates were primarily due to reduced tax exempt income which increased tax rates, partially offset by federal research tax credits.  The federal research tax credits were available during the three months ended April 2, 2011 and were not available during the three months ended April 3, 2010 as a result of the expiration of federal research credit legislation.   During the next twelve months, it is reasonably possible that audit resolutions and the expiration of statutes of limitations could potentially reduce our unrecognized tax benefits by up to $3.1 million. However, this amount may change because we continue to have ongoing negotiations with various taxing authorities throughout the year.</td></tr></table> 11. Income Taxes   Our effective income tax rates for the three months ended April 2, 2011 and April 3, 2010, were 34.1% and 33.8%, respectively.falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescription containing the entire income tax disclosure. Examples include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 136, 172 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 44, 45, 46, 47, 48, 49 falsefalseIncome Taxes12Income TaxesUnKnownUnKnownUnKnownUnKnownfalsetrue