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Summary of Option Activity Under Stock Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 02, 2016
USD ($)
$ / shares
shares
Shares  
Beginning Balance | shares 3,250
Granted | shares 4,572
Exercised | shares (4)
Exchanged | shares (1,700)
Cancelled | shares (788)
Ending Balance | shares 5,330
Exercisable at January 2, 2016 | shares 3,916
Weighted-Average Exercise Price  
Beginning Balance | $ / shares $ 30.72
Granted | $ / shares 6.61
Exercised | $ / shares 22.67
Exchanged | $ / shares 24.68
Cancelled | $ / shares 31.94
Ending Balance | $ / shares 11.79
Exercisable at January 2, 2016 | $ / shares $ 10.62
Outstanding at January 2, 2016 9 years 2 months 12 days
Exercisable at January 2, 2016 9 years 3 months 18 days
Outstanding at January 2, 2016 | $ $ 73,260
Exercisable at January 2, 2016 | $ $ 55,772