Accrued Mining and Landfill Reclamation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Asset Retirement Obligation Disclosure [Abstract]
Current portion of liabilities	$ 1.6	$ 0.5

Amount of obligations incurred and payable, pertaining to costs that are statutory in nature, incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include, but not limited to, taxes, interest, rent and utilities. Also includes the aggregate carrying amount of liabilities not separately disclosed.

No definition available.

Name:	us-gaap_AccruedLiabilitiesAndOtherLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant