Acquisitions	12 Months Ended
Feb. 28, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions On February 1, 2018, the Company completed the acquisition of all the assets and outstanding shares of Rogers Brothers Company ("Rogers Brothers"), a privately held company, based in Rockford, Illinois. Rogers Brothers provides galvanizing services to a multi-state area within the Midwest. The acquisition supports AZZ's goal of continued geographic expansion as well as portfolio expansion of its metal coatings services. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is not deductible for income tax purposes. On September 6, 2017, the Company completed the acquisition of all the assets and outstanding shares of Powergrid Solutions, Inc. ("PSI"), a privately held company, based in Oshkosh, Wisconsin. PSI designs, engineers and manufactures customized low and medium-voltage power quality, power generation and distribution equipment. PSI’s product portfolio includes metal-enclosed, metal-clad and padmount switchgear, serving the utility, commercial, industrial and renewable energy markets since 1982. The acquisition of PSI is a key addition to the Company's electrical switchgear portfolio. The addition of PSI’s low-voltage and padmount switchgear allows AZZ to offer a comprehensive portfolio of customized switchgear solutions to both existing and new customers in a diverse set of industries. The goodwill arising from this acquisition was allocated to the Energy Segment and is deductible for income tax purposes. On June 30, 2017, the Company completed the acquisition of the assets of Enhanced Powder Coating Ltd., (“EPC”), a privately held, high specification, National Aerospace and Defense Contractors Accreditation Program, ("NADCAP"), certified provider of powder coating, plating and anodizing services based in Gainesville, Texas. EPC, founded in 2003, offers a full spectrum of finish technology including powder coating, abrasive blasting and plating for heavy industrial, transportation, aerospace and light commercial industries. The acquisition of EPC is consistent with the Company's strategic initiative to grow its Metal Coatings segment with products and services that complement its industry-leading galvanizing business. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is deductible for income tax purposes. On March 1, 2016, the Company completed an acquisition of the equity securities of Power Electronics, Inc. ("PEI"), a Millington, Maryland-based manufacturer and integrator of electrical enclosure systems. The acquisition of PEI will enhance our capacity to serve existing and new customers in a diverse set of industries along the Eastern seaboard of the United States. The goodwill arising from this acquisition was allocated to the Energy Segment and is deductible for income tax purposes. On February 1, 2016, the Company completed its acquisition of substantially all the assets of Alpha Galvanizing Inc., an Atkinson, Nebraska-based business unit of Olson Industries, Inc. ("Alpha Galvanizing"). Alpha Galvanizing has served steel fabrication customers that manufacture electrical utility poles, agricultural machinery and industrial manufacturing components since 1996. Alpha Galvanizing was acquired to expand the footprint of AZZ Metal Coatings and to support AZZ’s locations in Minnesota and Denver, Colorado, as well as serve customers in the upper Midwest region. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is deductible for income tax purposes. On June 5, 2015, the Company completed the acquisition of substantially all the assets of US Galvanizing, LLC, a provider of steel corrosion coating services and a wholly-owned subsidiary of Trinity Industries, Inc. The acquisition of the US Galvanizing, LLC assets includes six galvanizing facilities located in Hurst, Texas; Kennedale, Texas; Big Spring, Texas; San Antonio, Texas; Morgan City, Louisiana; and Kosciusko, Mississippi. Additionally, the transaction includes Texas Welded Wire, a secondary business integrated within US Galvanizing's Hurst, Texas facility. US Galvanizing, LLC was acquired to expand AZZ’s Southern locations. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is deductible for income tax purposes. The Company paid $44.8 million, $22.7 million and $60.6 million, for these acquisitions, net of cash acquired, during fiscal 2018, 2017 and 2016, respectively. These acquisitions were not significant individually or in the aggregate for any fiscal year. Accordingly, disclosures of the purchase price allocations and unaudited pro forma results of operations have not been provided.

Acquisitions

On February 1, 2018, the Company completed the acquisition of all the assets and outstanding shares of Rogers Brothers Company ("Rogers Brothers"), a privately held company, based in Rockford, Illinois. Rogers Brothers provides galvanizing services to a multi-state area within the Midwest. The acquisition supports AZZ's goal of continued geographic expansion as well as portfolio expansion of its metal coatings services. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is not deductible for income tax purposes.

On September 6, 2017, the Company completed the acquisition of all the assets and outstanding shares of Powergrid Solutions, Inc. ("PSI"), a privately held company, based in Oshkosh, Wisconsin. PSI designs, engineers and manufactures customized low and medium-voltage power quality, power generation and distribution equipment. PSI’s product portfolio includes metal-enclosed, metal-clad and padmount switchgear, serving the utility, commercial, industrial and renewable energy markets since 1982. The acquisition of PSI is a key addition to the Company's electrical switchgear portfolio. The addition of PSI’s low-voltage and padmount switchgear allows AZZ to offer a comprehensive portfolio of customized switchgear solutions to both existing and new customers in a diverse set of industries. The goodwill arising from this acquisition was allocated to the Energy Segment and is deductible for income tax purposes.

On June 30, 2017, the Company completed the acquisition of the assets of Enhanced Powder Coating Ltd., (“EPC”), a privately held, high specification, National Aerospace and Defense Contractors Accreditation Program, ("NADCAP"), certified provider of powder coating, plating and anodizing services based in Gainesville, Texas. EPC, founded in 2003, offers a full spectrum of finish technology including powder coating, abrasive blasting and plating for heavy industrial, transportation, aerospace and light commercial industries. The acquisition of EPC is consistent with the Company's strategic initiative to grow its Metal Coatings segment with products and services that complement its industry-leading galvanizing business. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is deductible for income tax purposes.

On March 1, 2016, the Company completed an acquisition of the equity securities of Power Electronics, Inc. ("PEI"), a Millington, Maryland-based manufacturer and integrator of electrical enclosure systems. The acquisition of PEI will enhance our capacity to serve existing and new customers in a diverse set of industries along the Eastern seaboard of the United States. The goodwill arising from this acquisition was allocated to the Energy Segment and is deductible for income tax purposes.

On February 1, 2016, the Company completed its acquisition of substantially all the assets of Alpha Galvanizing Inc., an Atkinson, Nebraska-based business unit of Olson Industries, Inc. ("Alpha Galvanizing"). Alpha Galvanizing has served steel fabrication customers that manufacture electrical utility poles, agricultural machinery and industrial manufacturing components since 1996. Alpha Galvanizing was acquired to expand the footprint of AZZ Metal Coatings and to support AZZ’s locations in Minnesota and Denver, Colorado, as well as serve customers in the upper Midwest region. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is deductible for income tax purposes.

On June 5, 2015, the Company completed the acquisition of substantially all the assets of US Galvanizing, LLC, a provider of steel corrosion coating services and a wholly-owned subsidiary of Trinity Industries, Inc. The acquisition of the US Galvanizing, LLC assets includes six galvanizing facilities located in Hurst, Texas; Kennedale, Texas; Big Spring, Texas; San Antonio, Texas; Morgan City, Louisiana; and Kosciusko, Mississippi. Additionally, the transaction includes Texas Welded Wire, a secondary business integrated within US Galvanizing's Hurst, Texas facility. US Galvanizing, LLC was acquired to expand AZZ’s Southern locations. The goodwill arising from this acquisition was allocated to the Metal Coatings Segment and is deductible for income tax purposes.

The Company paid $44.8 million, $22.7 million and $60.6 million, for these acquisitions, net of cash acquired, during fiscal 2018, 2017 and 2016, respectively. These acquisitions were not significant individually or in the aggregate for any fiscal year. Accordingly, disclosures of the purchase price allocations and unaudited pro forma results of operations have not been provided.