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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 25, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 27, 2014, REG announced that its Board of Directors has authorized the exploration of strategic alternatives to enhance shareholder value, which may include a potential sale of Regal. REG's Board of Directors has retained Morgan Stanley & Co. LLC, Inc. as its financial advisor to assist in the review process. REG has not set a definitive timetable for completing its exploration of strategic alternatives and there can be no assurance that the process will result in any specific outcome. REG does not intend to disclose further developments during this process, unless and until its Board of Directors approves a specific course of action or otherwise concludes the review.