Debt - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended				1 Months Ended	12 Months Ended
	Dec. 27, 2014	Dec. 29, 2012	May 25, 2011	Mar. 14, 2012	Mar. 15, 2012	Aug. 31, 2003	Aug. 31, 2013	Dec. 28, 2013	Nov. 05, 2013
Debt Instrument [Line Items]
Acquisition of voting power	50.00%
Loss on extinguishment of debt		$ (12,000,000)
Short-term borrowings	1,000,000
Effective interest rate on short-term borrowings	5.00%
Short-term borrowings maximum month end amount	10,000,000
Short-term borrowings maximum amount occurred month	March 2014
Short-term borrowings maximum monthly average occurred month	March 2014
Maximum
Debt Instrument [Line Items]
Short-term borrowings maximum monthly average amount	6,000,000
Global Availability
Debt Instrument [Line Items]
Minimum availability level of borrowings to avoid cash settlement	150,000,000
European Availability
Debt Instrument [Line Items]
Minimum availability level of borrowings to avoid cash settlement	25,000,000
Amended Credit Agreement
Debt Instrument [Line Items]
Credit Agreement, maximum borrowing capacity			1,250,000,000
Credit Agreement, increased borrowing capacity			250,000,000
Extended maturity date			May 25, 2016
Minimum availability level of borrowings to avoid fixed charge coverage ratio test	125,000,000
Excess of debt default amount resulting termination of Facility	25,000,000
Excess acquisition of ownership percentage resulting termination of Facility	40.00%
Available credit under the Facility	1,100,000,000
Amount outstanding under credit facility	0
Amount outstanding under letters of credit	92,000,000
Average borrowings under the Facility	0
Line Of Credit Sub-Facility
Debt Instrument [Line Items]
Credit Agreement, current borrowing capacity			200,000,000
Letter Of Credit Sub Facility
Debt Instrument [Line Items]
Credit Agreement, current borrowing capacity			400,000,000
Swing Line Loan Facility
Debt Instrument [Line Items]
Credit Agreement, current borrowing capacity			125,000,000
Swing Line Loan Facility to European Borrowers
Debt Instrument [Line Items]
Credit Agreement, current borrowing capacity			25,000,000
Federal Funds Rate Plus
Debt Instrument [Line Items]
Alternate base rate and one month adjusted LIBO rate	0.50%
Adjusted LIBO Rate
Debt Instrument [Line Items]
Alternate base rate and one month adjusted LIBO rate	1.00%
Amendment
Debt Instrument [Line Items]
Credit Agreement, maximum borrowing capacity									1,250,000,000
Credit Agreement, current borrowing capacity									1,000,000,000
Letter of Credit
Debt Instrument [Line Items]
Credit Agreement, current borrowing capacity									38,000,000
9.75% Senior Secured Notes
Debt Instrument [Line Items]
Extended maturity date				Mar. 15, 2019
Aggregate principal amount of senior notes				250,000,000
Interest rate on senior notes				9.75%
Capitalized debt issuance costs				7,000,000
Final year of deferred finance costs amortization				2019
Senior notes, redemption rate excluding premium percentage	100.00%
Redemption prices, plus accrued and unpaid interest, Percentage	101.00%
9.75% Senior Secured Notes | Redeemed On or Prior To March 15, 2016
Debt Instrument [Line Items]
Senior notes, redemption rate of principal amount	104.875%
Senior notes, early redemption date	Mar. 15, 2016
9.75% Senior Secured Notes | Redeemed On or Prior To March 15, 2015
Debt Instrument [Line Items]
Senior notes, redemption rate of principal amount	109.75%
Senior notes, early redemption date	Mar. 15, 2015
Senior notes, redemption rate of principal amount	35.00%
6.25% Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of senior notes						400,000,000
Interest rate on senior notes						6.25%
Senior notes, issuance date						Aug. 01, 2003
Effective interest rate on senior notes						5.86%
Face amount of senior notes redeemed					250,000,000
Senior notes, redemption date					Mar. 15, 2012
Face amount of each note					1,000.00
Total consideration for each $1,000 note surrendered	1,050.00
Repaid Senior Notes							150,000,000
Recourse Debt
Debt Instrument [Line Items]
Short-term borrowings	$ 1,000,000							3,000,000
Recourse Debt | 7.35% debentures, due 2016
Debt Instrument [Line Items]
Interest rate on senior notes	7.35%							7.35%
Senior secured notes, due date	2016							2016
Recourse Debt | Revenue bonds, due in varying amounts periodically through 2029
Debt Instrument [Line Items]
Senior secured notes, due date	2029							2029
Recourse Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030
Debt Instrument [Line Items]
Interest rate on senior notes	5.00%							5.00%
Senior secured notes, due date	2030							2030