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Income Taxes - Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2015
Jan. 31, 2015
Oct. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Taxes [Line Items]                  
Increase in valuation allowance             $ 2,700    
Unrecognized deferred tax assets $ 83,300           83,300    
Undistributed foreign earnings 1,047,500           1,047,500    
Tax on deferred undistributed foreign earnings             232,000    
Increase in gross unrecognized tax benefits             8,000    
Gross unrecognized tax benefits 132,054   $ 124,102     $ 117,760 132,054 $ 124,102 $ 117,760
Unrecognized tax benefits affecting effective tax rate 129,400   120,500       129,400 120,500  
The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations             600 500 $ 200
The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations 2,200   1,300       2,200 1,300  
Estimated potential decrease in underlying unrecognized tax benefits, minimum 0           0    
Estimated potential decrease in underlying unrecognized tax benefits, maximum 36,000           36,000    
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities             $ 0 $ 1,858  
Internal Revenue Service (IRS) | Fiscal Year 2012                  
Taxes [Line Items]                  
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities         $ 10,000 6,000      
Decrease in deferred tax assets           4,900      
Tax impact from tax settlements           $ 1,100      
Internal Revenue Service (IRS) | Fiscal Year 2013                  
Taxes [Line Items]                  
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities     $ 5,500            
Taiwan | Fiscal Years 2009 and 2010                  
Taxes [Line Items]                  
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities       $ 5,100          
Tax impact from tax settlements       $ 3,900          
Taiwan | Fiscal Year 2014                  
Taxes [Line Items]                  
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities 1,200                
Taiwan | Fiscal Year 2013                  
Taxes [Line Items]                  
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities $ 1,200                
Fiscal Year 2012 | Taiwan                  
Taxes [Line Items]                  
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities   $ 1,100