Fair Market Value of Investments with Unrealized Losses Not Deemed to be Other-Than Temporarily Impaired (Detail) $ in Thousands	Jan. 02, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	$ 23,643
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	40
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	0
Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	16,160
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	30
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	0
U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	7,483
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	10
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	$ 0