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Subsequent Events (Notes)	12 Months Ended
Subsequent Events (Notes)	Feb. 28, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On March 12, 2018, the Company purchased certain assets through a bankruptcy sales process from Lectrus Corporation, a privately-held corporation based in Chattanooga, Tennessee. Lectrus designs and manufactures custom metal enclosures and provides electrical and mechanical integration. The acquisition will complement AZZ's current metal enclosure and switchgear businesses. On March 31, 2018, the Company made the final principal payment of $14.3 million to fully settle the 2008 Senior Notes on the scheduled maturity date.