Goodwill and Other Intangible Assets (Narrative) (Detail) (USD $)	1 Months Ended	9 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	May 31, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Jun. 30, 2013 Selling, General and Administrative Expenses [Member]	Jun. 30, 2012 Selling, General and Administrative Expenses [Member]	Jun. 30, 2013 Selling, General and Administrative Expenses [Member] Maximum [Member]	Jun. 30, 2012 Selling, General and Administrative Expenses [Member] Maximum [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 499,000,000	$ 480,000,000
Goodwill annual impairment	0
Useful life of intangible assets		19 years		6 years	20 years
Amortization of Intangible assets						4,000,000	1,000,000	10,000,000	1,000,000
Amortization expense estimated for year one		14,000,000
Amortization expense estimated for year two		14,000,000
Amortization expense estimated for year three		14,000,000
Amortization expense estimated for year four		14,000,000
Amortization expense estimated for year five		14,000,000
Asset impairment charges	$ 0