Redemption Prices (Expressed as Percentages of Principal Amount), plus Accrued and Unpaid Interest to the Redemption Date (Detail)	Sep. 30, 2011
Senior Notes Due 2019 | Fiscal Year 2015
Extinguishment of Debt [Line Items]
Redemption Price	103.25%
Senior Notes Due 2019 | Fiscal Year 2016
Extinguishment of Debt [Line Items]
Redemption Price	101.625%
Senior Notes Due 2019 | Fiscal Year 2017
Extinguishment of Debt [Line Items]
Redemption Price	100.00%
Senior Notes Due 2019 | Fiscal Year 2018
Extinguishment of Debt [Line Items]
Redemption Price	100.00%
Senior Notes Due 2019 | Fiscal Year 2019 and thereafter
Extinguishment of Debt [Line Items]
Redemption Price	100.00%
Senior Notes Due 2021 | Fiscal Year 2016
Extinguishment of Debt [Line Items]
Redemption Price	103.375%
Senior Notes Due 2021 | Fiscal Year 2017
Extinguishment of Debt [Line Items]
Redemption Price	102.25%
Senior Notes Due 2021 | Fiscal Year 2018
Extinguishment of Debt [Line Items]
Redemption Price	101.125%
Senior Notes Due 2021 | Fiscal Year 2019 and thereafter
Extinguishment of Debt [Line Items]
Redemption Price	100.00%