Shareholders' Equity (Capped Call Transaction) (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 30, 2017 $ / shares shares	Sep. 30, 2017 shares	Oct. 01, 2016 USD ($) shares $ / shares
Class of Stock [Line Items]
Additional paid in capital, capped calls | $			$ 7,935
Capped calls initial equivalent shares (in shares)			2,282,000
Capped calls settled, percentage		10.00%
Settlement of capped calls (in shares)	0	12,000
Minimum
Class of Stock [Line Items]
Option indexed to issuer's equity, strike price (in dollars per share) | $ / shares	$ 50.40		$ 50.40
Maximum
Class of Stock [Line Items]
Option indexed to issuer's equity, strike price (in dollars per share) | $ / shares	$ 58.80		$ 58.80
Common Stock | Minimum
Class of Stock [Line Items]
Common stock to be received and retired under capped calls (in shares)	0
Common Stock | Maximum
Class of Stock [Line Items]
Common stock to be received and retired under capped calls (in shares)	293,000