CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016	Sep. 24, 2016
Stockholders’ equity:
Common stock, par value (dollars per share)	$ 0.008	$ 0.008	$ 0.008
Common stock, shares authorized (in shares)	400,000,000	400,000,000	400,000,000
Common stock, shares issued (in shares)	170,232,000	169,943,000	169,859,000
Common stock, shares outstanding (in shares)	125,853,000	130,795,000	132,428,000
Preferred stock, par value (dollars per share)	$ 1.00	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	40,000	40,000	40,000
Preferred stock, shares issued (in shares)	0	0	0
Treasury stock, shares (in shares)	44,379,000	39,148,000	37,431,000