Income Taxes (Withholding Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Withholding taxes	$ 16,310	$ 13,408	$ 28,574	$ 22,399