Shareholders' Equity - Shareholder Cooperation and Standstill Agreement (Details) - board_members		6 Months Ended
	Mar. 24, 2017	Jul. 29, 2017
Equity [Abstract]
Days To Appoint Independent Director, Maximum	30 days
Number of Board Members Appointed By Affiliate	1	0
Business Days Prior to the Expiration of the Advance Notice Period for the Submission by Shareholders of Director Nominations	10 days
Calendar Days Prior to the First Anniversary of the 2017 Annual Meeting	100 days
Calendar Days' Prior Written Notice Delivered	10 days