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Performance Contingent TSR Shares (Detail) (Grant Date Seven July Two Thousand And Twelve, Total Shareholders Return, USD $)	9 Months Ended
	Oct. 06, 2012
Grant Date Seven July Two Thousand And Twelve \| Total Shareholders Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	137,500
Approximate vesting date	Feb. 28, 2014
Fair value per share	$ 23.18

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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