Schedule of Fair Value of Option Granted using Black-Scholes Pricing Model (Detail) (USD $)	9 Months Ended
	Jul. 27, 2012	Jul. 29, 2011
Equity Incentive Plan
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Volatility, minimum	41.62%	40.80%
Volatility, maximum	44.29%	42.78%
Risk-free interest rate, minimum	0.91%	2.02%
Risk-free interest rate, maximum	2.11%	3.64%
Dividends	$ 0	$ 0
Equity Incentive Plan | Minimum
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Expected life (in years)	4 years 6 months	4 years 6 months
Equity Incentive Plan | Maximum
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Expected life (in years)	9 years 6 months	9 years 6 months
Employee Sharesave Scheme
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Volatility, maximum	38.96%	51.10%
Risk-free interest rate, maximum	0.38%	0.98%
Expected life (in years)	3 years	3 years
Dividends	$ 0	$ 0