Commitments And Contingencies (Narrative) (Details) (USD $)	Jan. 31, 2013	Apr. 30, 2012
Commitments And Contingencies [Line Items]
Accounts payable, accrued expenses and other current liabilities	$ 479,660,000	$ 567,079,000
Other noncurrent liabilities	328,402,000	388,132,000
Revolving line of credit obligation	90,000,000
Remaing obligation commitment	13,500,000
Credit card agreement obligations	30,500,000
Remaining credit card agreement commitments	7,400,000
Compensating balance	400,000
Standard Guarantee [Member]
Commitments And Contingencies [Line Items]
Accounts payable, accrued expenses and other current liabilities	14,900,000	16,300,000
Contingent Payments [Member]
Commitments And Contingencies [Line Items]
Other noncurrent liabilities	$ 10,900,000	$ 6,800,000