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Financing Agreements - (Details) (USD $)
12 Months Ended
Apr. 27, 2013
Line of Credit Facility [Line Items]  
Debt instrument, actual, fixed charge coverage ratio 6400.00%
Debt instrument, actual, interest-bearing debt, ratio 1.00%
Domestic Line of Credit
 
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity $ 35,000,000.0
Effective interest rate 1.50%
Line of credit facility, unused capacity, commitment fee percentage 0.125%
Line of credit facility, amount outstanding 0
Debt instrument, restrictive covenants, fixed charge coverage ratio 200.00%
Debt instrument, restrictive covenants, capital expenditure reserve, amount 6,000,000
Debt instrument, restrictive covenants, interest-bearing debt, ratio 100.00%
Letter of Credit
 
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 15,000,000.0
Foreign Line of Credit
 
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 35,000,000.0
Line of credit facility, amount outstanding 0
Debt instrument, restrictive covenants, fixed charge coverage ratio 200.00%
Debt instrument, restrictive covenants, capital expenditure reserve, amount $ 6,000,000
Debt instrument, restrictive covenants, interest-bearing debt, ratio 100.00%
LIBOR | Minimum | Domestic Line of Credit
 
Line of Credit Facility [Line Items]  
Debt instrument, basis spread on variable rate 1.25%
LIBOR | Maximum | Domestic Line of Credit
 
Line of Credit Facility [Line Items]  
Debt instrument, basis spread on variable rate 1.75%