Pension Plans and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Components of net periodic benefit costs included in operating expenses [Abstract]
Projected annual contribution requirements related to the Partnership's postretirement health care and life insurance benefit plan for fiscal year			$ 1,337
Employer contribution for postretirement health care and life insurance			878
Partnership established accrual for estimated obligation to certain MEPPs	6,909		6,909
Number of voluntary partial withdrawal from multi employer pension plans			1
Number of full withdrawal from multi employer pension plans			4
Pension Benefits [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Interest cost	1,443	1,307	4,330	3,921
Expected return on plan assets	(1,275)	(1,320)	(3,826)	(3,961)
Amortization of net loss	1,123	1,321	3,369	3,964
Net periodic benefit cost	1,291	1,308	3,873	3,924
Postretirement Benefits [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Service cost	1	2	4	6
Interest cost	160	146	480	439
Amortization of prior service costs	(122)	(122)	(367)	(367)
Amortization of net loss	(46)	0	(137)	0
Net periodic benefit cost	$ (7)	$ 26	$ (20)	$ 78