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Restructuring Charges, Activity for Restructuring and Reinvestment Program Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		69 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring charges	$ 2,208	$ 9,118	$ 26,531	$ 15,045
Payments			(26,345)	(15,740)
Restructuring and Reinvestment Program [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			22,790
Restructuring charges	2,208	9,118	26,531	15,045	$ 164,475
Payments			(26,345)
Foreign translation & reclassifications			(1,144)
Restructuring liability, end of period	21,832		21,832		21,832
Restructuring and Reinvestment Program [Member] \| Severance [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			10,082
Restructuring charges	1,781	3,420	25,047	7,999	112,637
Payments			(17,435)
Foreign translation & reclassifications			732
Restructuring liability, end of period	18,426		18,426		18,426
Restructuring and Reinvestment Program [Member] \| Process Reengineering Consulting [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			0
Restructuring charges	427	10	1,948	16	20,762
Payments			(1,749)
Foreign translation & reclassifications			0
Restructuring liability, end of period	199		199		199
Restructuring and Reinvestment Program [Member] \| Other Activities [Member]
Activity for Restructuring and Reinvestment Program liability [Roll Forward]
Restructuring liability, beginning of period			12,708
Restructuring charges	0	$ 5,688	(464)	$ 7,030	31,076
Payments			(7,161)
Foreign translation & reclassifications			(1,876)
Restructuring liability, end of period	3,207		3,207		3,207
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	1,000		1,000		1,000
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	$ 2,200		$ 2,200		$ 2,200