Debt and Credit Facilities (Tables)

12 Months Ended

Apr. 30, 2015

Debt Disclosure [Abstract]

Schedule of long-term debt

Our long-term debt (net of unamortized discount) consisted of:

April 30,	2014		2015
2.50% senior notes, due in fiscal 2016	$	249	$	250
1.00% senior notes, due in fiscal 2018	249		249
2.25% senior notes, due in fiscal 2023	249		249
3.75% senior notes, due in fiscal 2043	250		250
	997		998
Less current portion	—		250
	$	997	$	748