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Document and Entity Information
6 Months Ended
Mar. 31, 2019
shares
Document And Entity Information [Abstract]  
Document Type 10-Q
Document Period End Date Mar. 31, 2019
Amendment Flag false
Entity Registrant Name AIR PRODUCTS & CHEMICALS INC /DE/
Entity Central Index Key 0000002969
Current Fiscal Year End Date --09-30
Entity Filer Category Large Accelerated Filer
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q2
Entity Common Stock, Shares Outstanding 220,132,561
Entity Emerging Growth Company false
Entity Small Business false