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Self-Insurance Reserves (Details Textual) (USD $)
 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Apr. 30, 2012
Self-Insurance Reserves (Textual) [Abstract]      
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs $ 9,300,000   $ 9,000,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, Non-current portion 5,500,000   5,400,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, included in accrued expenses 2,400,000   2,200,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, included in accrued product/municipal liability 1,400,000   0
Workers' compensation receivable classified as an other asset 332,000    
Amounts charged to expense 6,200,000 5,700,000  
Accrued reserves for product and municipal litigation liabilities 4,300,000   4,500,000
Accrued reserves for product and municipal litigation liabilities, Non-current portion 2,900,000   3,100,000
Receivables from insurance carriers, included in other assets 1,900,000   2,000,000
Receivables from insurance carriers, included in other current assets $ 25,000