XML 95 R84.htm IDEA: XBRL DOCUMENT v3.3.1.900
Net Income per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Jan. 29, 2016
Jan. 23, 2015
Jan. 29, 2016
Jan. 23, 2015
Earnings Per Share [Abstract]        
Employee equity award plans 11 7 13 8