Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
$ in Billions
12 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Mar. 31, 2019
Cover page.      
Document Type 10-K    
Document Quarterly Report true    
Document Period End Date Sep. 30, 2019    
Document Transition Report false    
Entity File Number 0-09115    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 25-0644320    
Entity Address, Address Line One Two Northshore Center,    
Entity Address, City or Town Pittsburgh,    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 15212‑5851    
City Area Code (412)    
Local Phone Number 442-8200    
Title of 12(b) Security Class A Common Stock, $1.00 par value    
Trading Symbol MATW    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1.1
Entity Common Stock, Shares Outstanding   31,339,703  
Entity Central Index Key 0000063296    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false