Restructuring and Integration Costs (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jan. 31, 2016	Oct. 31, 2016	Jan. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Activities, Completion Date		Oct. 31, 2016
Sauflon [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred as of October 31, 2016		$ 148,300,000	$ 0
Additions during the period		(56,600,000)
Integration costs	$ 7,900,000
Sauflon [Member] | Product Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred as of October 31, 2016		129,400,000
Additions during the period		(56,400,000)
Sauflon [Member] | Product Rationalization [Member] | Cost of sales [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period	(10,500,000)
Sauflon [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred as of October 31, 2016		17,800,000
Additions during the period		0
Sauflon [Member] | Employee Severance [Member] | Cost of sales [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period	200,000
Sauflon [Member] | Employee Severance [Member] | Selling, general and administrative expense [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period	(100,000)
Sauflon [Member] | Employee Severance [Member] | Research and development expense [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period	(100,000)
Sauflon [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative amounts incurred as of October 31, 2016		1,100,000
Additions during the period		$ (200,000)
Sauflon [Member] | Facility Closing [Member] | Selling, general and administrative expense [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period	$ (300,000)