Weighted-Average Stock Options and Warrants Outstanding Not included in Computation of Diluted Shares Outstanding (Detail) (Convertible Notes Payable Due 2012 [Member], Convertible Notes Payable [Member], USD $) In Millions, except Share data, unless otherwise specified	2 Months Ended
	Sep. 30, 2012	Sep. 29, 2012
Convertible Notes Payable Due 2012 [Member] | Convertible Notes Payable [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of EPS	4,938,624
Debt instrument, face amount		$ 320.0