Cover Page - shares	3 Months Ended
	Oct. 31, 2019	Nov. 30, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 31, 2019
Document Transition Report	false
Entity File Number	1-7891
Entity Registrant Name	DONALDSON COMPANY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	41-0222640
Entity Address, Address Line One	1400 West 94th Street
Entity Address, City or Town	Minneapolis
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55431
City Area Code	952
Local Phone Number	887-3131
Title of 12(b) Security	Common Stock, $5.00 par value
Trading Symbol	DCI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		126,560,779
Entity Central Index Key	0000029644
Current Fiscal Year End Date	--07-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false