Employee Benefit Plans - Schedule of Defined Benefit Plans Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Reconciliation of benefit obligations:
Lump sum benefits paid	$ (5,777)
Pension Benefits [Member]
Reconciliation of benefit obligations:
Benefit obligation at beginning of year	149,836	$ 148,631
Interest cost	5,128	5,774	$ 5,229
Actuarial loss (gain)	5,239	8,459
Lump sum benefits paid	(5,777)	(5,401)
Ordinary benefits paid	(7,519)	(7,627)
Benefit obligation at end of year	146,907	149,836	148,631
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	117,771	120,776
Actual return on plan assets	(172)	10,023
Lump sum benefits paid	(5,777)	(5,401)
Ordinary benefits paid	(7,519)	(7,627)
Fair value of plan assets at end of year	104,303	117,771	120,776
Funded status:
Funded status at end of year	(42,604)	(32,065)
Amounts recognized in consolidated balance sheets consist of:
Net amount recognized at end of year	(42,604)	(32,065)
Noncurrent benefit liability	(42,604)	(32,065)
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss):
Actuarial net (loss) gain	(52,836)	(49,034)
Net amount recognized in accumulated other comprehensive (loss) income	(52,836)	(49,034)
Retiree Health and Life Benefits [Member]
Reconciliation of benefit obligations:
Benefit obligation at beginning of year	16,954	17,754
Interest cost	575	645	594
Actuarial loss (gain)	(1,281)	(278)
Ordinary benefits paid	(954)	(1,167)
Benefit obligation at end of year	15,294	16,954	$ 17,754
Reconciliation of fair value of plan assets:
Employer contributions	954	1,167
Ordinary benefits paid	(954)	(1,167)
Funded status:
Funded status at end of year	(15,294)	(16,954)
Amounts recognized in consolidated balance sheets consist of:
Net amount recognized at end of year	(15,294)	(16,954)
Less: current portion	1,025	1,276
Noncurrent benefit liability	(14,269)	(15,678)
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss):
Actuarial net (loss) gain	4,865	3,780
Prior service credits	399	889
Net amount recognized in accumulated other comprehensive (loss) income	$ 5,264	$ 4,669