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Long-Term Debt and Lines of Credit - Long-Term Debt Narrative (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 6 Months Ended 0 Months Ended 12 Months Ended 6 Months Ended
Oct. 28, 2012
Apr. 29, 2012
Aug. 11, 2011
Unsecured senior term notes [Member]
Bodet And Horst [Member]
Oct. 28, 2012
Unsecured senior term notes [Member]
Bodet And Horst [Member]
Aug. 11, 2008
Unsecured senior term notes [Member]
Bodet And Horst [Member]
Aug. 11, 2012
Unsecured senior term notes [Member]
Bodet And Horst [Member]
Long-term Debt [Member]
Aug. 11, 2012
Unsecured senior term notes [Member]
Bodet And Horst [Member]
Long-term Debt [Member]
Oct. 28, 2012
Government Of Quebec Term Loan [Member]
Installment
Debt Instrument [Line Items]                
Issuance of unsecured term notes         $ 11.0      
Fixed interest rate         8.01%      
Term of the note agreement       Seven years        
Required amount of principal payment installments       2.2        
Date of first required principal payment       Aug. 11, 2011       Dec. 01, 2009
Required debt payment frequency       Annual       Monthly
Average term period for principal payments, in years       2 years 9 months 18 days        
Maturity date       Aug. 11, 2015        
Principal payment paid     2.2     2.2 4.4  
Number of equal installment payments required from loan inception               48
Principal payment requirements of long-term debt for the first year 2.4              
Principal payment requirements of long-term debt for the second year 2.2              
Principal payment requirements of long-term debt for the third year 2.2              
Long-term debt, fair value $ 6.2 $ 8.1