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Self-Insurance Reserves - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Apr. 30, 2013
Self Insurance Reserves [Line Items]          
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs $ 10,000,000   $ 10,000,000   $ 9,600,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, Non-current portion 6,100,000   6,100,000   5,700,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, included in accrued expenses 2,400,000   2,400,000   2,300,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, included in accrued product/municipal liability 1,500,000   1,500,000   1,600,000
Workers' compensation receivable classified as an other asset 380,000   380,000   332,000
Amounts charged to expense 2,800,000 2,800,000 5,600,000 6,200,000  
Accrued reserves for product and municipal litigation liabilities 4,500,000   4,500,000   4,400,000
Accrued reserves for product and municipal litigation liabilities, Non-current portion 3,000,000   3,000,000   2,800,000
Receivables from insurance carriers, included in other assets 1,900,000   1,900,000   1,900,000
Receivables from insurance carriers, included in other current assets $ 25,000   $ 25,000   $ 25,000