Basis of Presentation (Narrative) (Details)	3 Months Ended
Mar. 31, 2013	Jul. 02, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of mining complexes operated	16
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		0.50%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant