Document and Entity Information	3 Months Ended
	Dec. 31, 2017 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--09-30
Entity Registrant Name	AIR PRODUCTS & CHEMICALS INC /DE/
Entity Central Index Key	0000002969
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	218,939,303