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Stockholders' Equity	12 Months Ended
Stockholders' Equity	Apr. 30, 2017
Stockholders' Equity Note [Abstract]
Stockholders' Equity	During fiscal year 2017, we repurchased and immediately retired 14.0 million shares of stock at an aggregate cost of $317.0 million, or an average price of $22.61 per share. During fiscal year 2016, we repurchased and immediately retired 56.4 million shares of stock at an aggregate cost of $2.0 billion, or an average price of $35.46 per share. We had no similar repurchases or retirements of common stock in fiscal year 2015. As of April 30, 2017 and 2016, substantially all of the balance of our accumulated comprehensive loss consisted of foreign currency translation adjustments.