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Taxes - Additional Information (Detail) (USD $)
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12 Months Ended | 6 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||
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Oct. 31, 2012
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Oct. 31, 2011
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Oct. 31, 2010
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Oct. 31, 2010
Increase Net
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Oct. 31, 2012
Internal Revenue Service (IRS)
Fiscal Years 2010 and 2011
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Apr. 30, 2011
Internal Revenue Service (IRS)
Fiscal Years 2006 through 2009
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Oct. 31, 2012
Taiwan
Fiscal Year 2008
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Oct. 31, 2012
Hungary
Fiscal Year 2006 Through 2008
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Oct. 31, 2012
Hungary
Fiscal Years 2009 And 2010
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Oct. 31, 2012
Hungary
Fiscal Years 2009 And 2010
Cash Payment Obligations
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Oct. 31, 2012
Hungary
Fiscal Years 2009 And 2010
Cash payment
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Jul. 31, 2012
Hungary
Fiscal Year 2006 Through 2010
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Apr. 30, 2012
Hungary
Fiscal Year 2006 Through 2010
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Jan. 31, 2011
Synplicity, Inc.
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Oct. 31, 2010
Avant! Corporation
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| Taxes [Line Items] | |||||||||||||||
| Increase in valuation allowance | $ 12,900,000 | ||||||||||||||
| Unrecognized deferred tax assets | 48,200,000 | ||||||||||||||
| Undistributed foreign earnings | 615,200,000 | ||||||||||||||
| Tax on deferred undistributed foreign earnings | 135,800,000 | ||||||||||||||
| Decrease in gross unrecognized tax benefits | 68,200,000 | ||||||||||||||
| Gross unrecognized tax benefits | 109,680,000 | 177,893,000 | 213,923,000 | ||||||||||||
| Unrecognized tax benefits affecting effective tax rate | 75,300,000 | 177,500,000 | |||||||||||||
| The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations | (5,800,000) | 2,800,000 | 3,400,000 | ||||||||||||
| The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations | 600,000 | 7,400,000 | |||||||||||||
| Estimated potential decrease in underlying unrecognized tax benefits, minimum | 0 | ||||||||||||||
| Estimated potential decrease in underlying unrecognized tax benefits, maximum | 16,000,000 | ||||||||||||||
| Decrease in unrecognized tax benefits resulting from settlement with taxing authorities | 80,137,000 | 1,258,000 | 24,700,000 | 35,900,000 | 16,500,000 | 24,200,000 | 27,000,000 | 4,000,000 | 67,800,000 | ||||||
| Tax impact from tax settlements | 15,900,000 | 32,800,000 | 14,700,000 | 6,300,000 | 94,300,000 | ||||||||||
| Release of valuation allowance | 21,600,000 | ||||||||||||||
| Tax adjustments settlements and unusual provisions | 72,300,000 | 55,400,000 | |||||||||||||
| Decrease in deferred tax assets due to utilization of foreign tax credit carryover net of reversal of valuation allowance | 25,200,000 | ||||||||||||||
| Cash payments as a result of settlement | $ 5,100,000 | $ 3,200,000 | $ 10,900,000 | ||||||||||||