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Quarterly Financial Information (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended			3 Months Ended			4 Months Ended		12 Months Ended
	Dec. 04, 2013	Jul. 25, 2013	Mar. 07, 2013	Sep. 03, 2013	Mar. 19, 2013	Sep. 04, 2012	Dec. 30, 2014	Dec. 31, 2013	Dec. 30, 2014	Dec. 31, 2013	Dec. 25, 2012
Quarterly Financial Information [Abstract]
Secondary public offering costs	$ 231dfrg_CommonStockIssuanceCost	$ 381dfrg_CommonStockIssuanceCost	$ 412dfrg_CommonStockIssuanceCost	$ 381dfrg_CommonStockIssuanceCost	$ 412dfrg_CommonStockIssuanceCost			$ 231dfrg_CommonStockIssuanceCost	$ 5dfrg_CommonStockIssuanceCost	$ 1,024dfrg_CommonStockIssuanceCost
Transaction bonus expense				3,705dfrg_TransactionBonusesPaid	1,805dfrg_TransactionBonusesPaid			2,845dfrg_TransactionBonusesPaid
Non-cash impairment charges							3,536us-gaap_AssetImpairmentCharges	2,360us-gaap_AssetImpairmentCharges	3,536us-gaap_AssetImpairmentCharges	2,360us-gaap_AssetImpairmentCharges
Write-off of debt issuance costs						$ 1,649					$ 1,649