Long-Term Debt - Interest Rates (Detail)	Dec. 28, 2014	Sep. 28, 2014
Unsecured notes bearing fixed rate interest at 8.75% due November 2014
Debt Disclosure [Line Items]
Interest rate stated percentage	8.75%
Unsecured notes bearing fixed rate interest at 10% due June 2015
Debt Disclosure [Line Items]
Interest rate stated percentage	10.00%
Unsecured notes bearing fixed rate interest at 6.375% due September 2015
Debt Disclosure [Line Items]
Interest rate stated percentage	6.375%
Unsecured notes bearing fixed rate interest at 10% due April 2016
Debt Disclosure [Line Items]
Interest rate stated percentage	10.00%
Unsecured notes bearing fixed rate interest at 9.375% due November 2017
Debt Disclosure [Line Items]
Interest rate stated percentage	9.375%
Unsecured notes bearing fixed rate interest at 7.125% due September 2018
Debt Disclosure [Line Items]
Interest rate stated percentage	7.125%
Unsecured notes bearing fixed rate interest at 5.125% due October 2019
Debt Disclosure [Line Items]
Interest rate stated percentage	5.125%
Unsecured notes bearing fixed rate interest at 5.125% due July 2020
Debt Disclosure [Line Items]
Interest rate stated percentage	5.125%
Unsecured notes bearing fixed rate interest at 4.875% due September 2021
Debt Disclosure [Line Items]
Interest rate stated percentage	4.875%	4.875%
Unsecured notes bearing fixed rate interest at 6.375% due October 2023
Debt Disclosure [Line Items]
Interest rate stated percentage	6.375%
Unsecured notes bearing fixed rate interest at 5.50% due September 2024
Debt Disclosure [Line Items]
Interest rate stated percentage	5.50%	5.50%
Unsecured notes bearing fixed rate interest at 7.75% due June 2027
Debt Disclosure [Line Items]
Interest rate stated percentage	7.75%
Unsecured notes bearing fixed rate interest at 7.25% due September 2027
Debt Disclosure [Line Items]
Interest rate stated percentage	7.25%