Financial Instruments and Hedging Activities (Summary of Outstanding Shares Subject to Security Price Guarantees) (Detail) (Security Price Guarantees Issued Date On August Fourteen Twenty Twelve [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013
Security Price Guarantees Issued Date On August Fourteen Twenty Twelve [Member]
Derivative [Line Items]
Issue Date	Aug. 15, 2013
Number of Shares Issued	934,960
Settlement Date	Feb. 15, 2014
Total Value of Shares on Issue Date	$ 18,400