Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Apr. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

The following table shows the changes in goodwill (which include no accumulated impairment losses) and other intangible assets over the past two years:

	Goodwill			Other Intangible Assets
Balance as of April 30, 2016	$	590		$	595
Acquisition of business (Note 16)	183			65
Foreign currency translation adjustment	(20		)	(19		)
Balance as of April 30, 2017	753			641
Foreign currency translation adjustment	10			31
Impairment	—			(2		)
Balance as of April 30, 2018	$	763		$	670