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Subsequent Events	12 Months Ended
Subsequent Events	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	20. SUBSEQUENT EVENTS On November 5, 2020, we acquired all of the stock in K.E.P. Electric, Inc., a Batavia, Ohio-based electrical contractor specializing in the design and installation of electrical systems for single-family housing and multi-family developments. This business will operate as a subsidiary in our Residential segment. On November 19, 2020, we acquired all of the stock of Wedlake Fabricating, Inc., a Tulsa, Oklahoma-based manufacturer of custom generator enclosures. This business will operate as a subsidiary in our Infrastructure Solutions segment. The acquisitions were financed using cash on hand, and do not have a material impact on our overall liquidity.