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Restructuring Charges, Activity for Restructuring and Reinvestment Program Liability (Details) - USD ($) $ in Thousands	12 Months Ended			60 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2017
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Charges	$ 13,355	$ 28,611	$ 28,804
Restructuring and Reinvestment Program [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	28,509
Charges	13,355	28,611	28,804	$ 137,944
Payments	(22,854)
Foreign translation & reclassification	3,780
Restructuring liability, end of period	22,790	28,509		22,790
Restructuring and Reinvestment Program [Member] \| Severance [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	16,657
Charges	8,386	16,443	17,093	87,590
Payments	(14,116)
Foreign translation & reclassification	(845)
Restructuring liability, end of period	10,082	16,657		10,082
Restructuring and Reinvestment Program [Member] \| Process Reengineering Consulting [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	0
Charges	148	7,191	301	18,814
Payments	(148)
Foreign translation & reclassification	0
Restructuring liability, end of period	0	0		0
Restructuring and Reinvestment Program [Member] \| Other Activities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	11,852
Charges	4,821	4,977	$ 11,410	31,540
Payments	(8,590)
Foreign translation & reclassification	4,625
Restructuring liability, end of period	12,708	$ 11,852		12,708
Restructuring and Reinvestment Program [Member] \| Other Activities [Member] \| Other Accrued Liabilities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, end of period	2,700			2,700
Restructuring and Reinvestment Program [Member] \| Other Activities [Member] \| Other Long-Term Liabilities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, end of period	$ 10,000			$ 10,000