Contractual Maturities of Available-For-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013
Amortized Cost
Amortized Cost, Due in one year or less	$ 55,702
Amortized Cost, Due after one through two years	22,654
Amortized Cost, Due after ten years	1,160
Amortized Cost	79,516
Fair Value
Fair Value, Due in one year or less	55,734
Fair Value, Due after one through two years	22,668
Fair Value, Due after ten years	1,160
Fair Value	$ 79,562