Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 490,298	$ 464,107	$ 422,833	$ 346,073	$ 248,461	$ 218,767	$ 199,882	$ 190,275	$ 1,723,311	$ 857,385	$ 802,460
Gross profit	222,054	207,186	179,515	141,514	114,336	94,559	88,599	83,898	750,269	381,392	335,399
Net income	$ 73,752	$ 61,117	$ 41,845	$ 30,408	$ 30,785	$ 18,650	$ 17,781	$ 20,286	$ 207,122	$ 87,502	$ 76,409
Net income per share (in dollars per share)	$ 3.00	$ 2.49	$ 1.71	$ 1.25	$ 1.27	$ 0.77	$ 0.74	$ 0.85	$ 8.46	$ 3.62	$ 3.09
Net income per share (in dollars per share)	$ 2.96	$ 2.46	$ 1.69	$ 1.23	$ 1.25	$ 0.76	$ 0.73	$ 0.84	$ 8.36	$ 3.58	$ 3.06