Summary of Significant Accounting Policies (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 23, 2012	Nov. 25, 2011	Nov. 23, 2012	Nov. 25, 2011	Feb. 22, 2013	Feb. 24, 2012
Subsidiary or Equity Method Investee [Line Items]
Portion of amount not realized for costs and estimated earnings in excess of billings on uncompleted long-term contracts, minimum period (in years)			1 year
Number of weeks in reference to quarterly period (in weeks)	13	13	39	39
Number of weeks in reference to fiscal period (in weeks)					52	52
ETC-PZL [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage of ownership interest owned (in hundredths)	95.00%		95.00%
ETC-Europe [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage of ownership interest owned (in hundredths)	99.00%		99.00%