Long-Term Debt (Components of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 30, 2011	Apr. 30, 2010
Acquisition obligations	$ 43,273	$ 28,701
Capital Lease Obligations	10,953	11,526
total long term debt	1,053,191	1,038,832
Current portion of long-term debt	(3,437)	(3,688)
Long-term debt	1,049,754	1,035,144
Minimum [Member]
Long-term debt due date	May 2011
Maximum [Member]
Long-term debt due date	December 2022
Senior Notes 7.875 % Due January 2013 [Member]
Senior notes long-term debt	599,788	599,664
Long-term debt due date	January 15, 2013
Stated interest rate	7.875%
Senior Notes 5.125 % Due October 2014 [Member]
Senior notes long-term debt	$ 399,177	$ 398,941
Long-term debt due date	October 30, 2014
Stated interest rate	5.125%

Long Term Acquisition Obligation

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- Definition

Long Term Debt Maturity Date

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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-Name Regulation S-X (SX)
-Number 210
-Article 7
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Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer).

+ References

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- Definition

Interest rate stated in the contractual debt agreement.

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-Name Regulation S-X (SX)
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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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-Publisher SEC
-Name Regulation S-X (SX)
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