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Number of banks.

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Interest rate stated in the contractual debt agreement.

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Amount borrowed under the credit facility as of the balance sheet date.

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Debt and Financing Arrangements (Details Textual) (USD $)	3 Months Ended
	Jul. 31, 2013 Bank	Jul. 31, 2012	Apr. 30, 2013
Debt and Financing Arrangements (Additional Textual) [Abstract]
Number of banks	9
Revolving credit facility maximum borrowing capacity	$ 1,000,000,000
Percentage of the principal amount thereof which company can prepay	100.00%
Interest paid	22,400,000	22,200,000
Outstanding balance under revolving credit facility	85,000,000		0
Revolving credit facility weighted-average interest rate	1.47%
[SeniorNotesDuePeriodTwoMember]
Debt and Financing Arrangements (Textual) [Abstract]
Percentage of notes	4.78%		4.78%
[SeniorNotesDuePeriodThreeMember]
Debt and Financing Arrangements (Textual) [Abstract]
Percentage of notes	6.12%		6.12%
[SeniorNotesDuePeriodFourMember]
Debt and Financing Arrangements (Textual) [Abstract]
Percentage of notes	6.63%		6.63%
[SeniorNotesDuePeriodSevenMember]
Debt and Financing Arrangements (Textual) [Abstract]
Percentage of notes	3.50%		3.50%
[SeniorNotesDuePeriodFiveMember]
Debt and Financing Arrangements (Textual) [Abstract]
Percentage of notes	5.55%		5.55%
Payment of Senior Notes due in fiscal 2014	50,000,000
[SeniorNotesDuePeriodSixMember]
Debt and Financing Arrangements (Textual) [Abstract]
Percentage of notes	4.50%		4.50%
First period payment of Senior Notes	$ 100,000,000