CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Sep. 27, 2013
Statement of Comprehensive Income [Abstract]
Net gain/(loss) arising during the year, tax benefit/(expense)	$ 905	$ 930	$ (1,504)
Prior service cost arising during the year, tax expense	0	(1,240)	0
Amortization of prior service cost included in net periodic benefit cost, tax benefit/(expense)	170	(27)	159
Amortization of net actuarial loss included in net periodic benefit cost, tax expense	(663)	(529)	(608)
Increase (decrease) in unrealized gain, tax benefit/(expense)	(837)	(1,467)	(191)
Reclassification adjustments, tax benefit/(expense)	1,413	479	923
Increase (decrease) in unrealized gain (loss), tax benefit	$ 52	$ 0	$ 0