Restructuring and Related Charges, Activity for Restructuring and Reinvestment Program Liability (Details) - Restructuring and Reinvestment Program [Member] $ in Thousands	9 Months Ended
	Jan. 31, 2019 USD ($)
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	$ 20,051
Charges	3,562
Payments	(12,581)
Foreign translation & other adjustments	32
Restructuring liability, end of period	11,064
Severance [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	17,279
Charges	1,983
Payments	(11,108)
Foreign translation & other adjustments	(229)
Restructuring liability, end of period	7,925
Consulting and Contract Termination Costs [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	0
Charges	526
Payments	(223)
Foreign translation & other adjustments	0
Restructuring liability, end of period	303
Other Activities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period	2,772
Charges	1,053
Payments	(1,250)
Foreign translation & other adjustments	261
Restructuring liability, end of period	2,836
Other Activities [Member] | Other Accrued Liabilities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, end of period	1,200
Other Activities [Member] | Other Long-Term Liabilities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, end of period	$ 1,600