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Restructuring and Related Charges, Activity for Restructuring and Reinvestment Program Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
(Credits) charges	$ 9,996	$ (1,406)	$ 3,910	$ 24,323
Restructuring and Reinvestment Program [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			20,051
(Credits) charges	9,996	(1,406)	3,910	24,323
Payments			(9,295)
Foreign translation & reclassifications			(236)
Restructuring liability, end of period	14,430		14,430
Restructuring and Reinvestment Program [Member] \| Severance [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			17,279
(Credits) charges	8,672	(1,455)	2,894	23,266
Payments			(8,295)
Foreign translation & reclassifications			(446)
Restructuring liability, end of period	11,432		11,432
Restructuring and Reinvestment Program [Member] \| Process Reengineering Consulting [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			0
(Credits) charges	90	0	225	1,521
Payments			(175)
Foreign translation & reclassifications			0
Restructuring liability, end of period	50		50
Restructuring and Reinvestment Program [Member] \| Other Activities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			2,772
(Credits) charges	1,234	$ 49	791	$ (464)
Payments			(825)
Foreign translation & reclassifications			210
Restructuring liability, end of period	2,948		2,948
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	1,200		1,200
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	$ 1,700		$ 1,700