Acquisitions	12 Months Ended
Feb. 28, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions On March 1, 2016, we 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. Unaudited pro forma results of operations assuming the PEI acquisition had taken place at the beginning of each period are not provided because the historical operating results of PEI were not significant and pro forma results would not be significantly different from reported results for the periods presented. On February 1, 2016, we completed our 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 Galvanizing 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 Galvanizing Segment and is deductible for income tax purposes. Unaudited pro forma results of operations assuming the Alpha Galvanizing Inc. acquisition had taken place at the beginning of each period are not provided because the historical operating results of Alpha Galvanizing Inc. were not significant and pro forma results would not be significantly different from reported results for the periods presented. On June 5, 2015, we 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 Galvanizing Segment and is deductible for income tax purposes. Unaudited pro forma results of operations assuming the US Galvanizing, LLC acquisition had taken place at the beginning of each period are not provided because the historical operating results of US Galvanizing, LLC were not significant and pro forma results would not be significantly different from reported results for the periods presented. On June 30, 2014, we completed our acquisition of substantially all the assets of Zalk Steel & Supply Co. (“Zalk Steel”), a Minneapolis, Minnesota-based galvanizing company, for a purchase price of $10.5 million and the assumption of $0.3 million in liabilities. The Company recorded $3.3 million of goodwill, which has been allocated to the Galvanizing Segment, and $3.4 million of intangible assets associated with this acquisition. The intangible assets associated with the acquisition consist primarily of trade names, customer relationships and non-compete agreements. These intangible assets are being amortized on a straight-line basis over a period of 19 years for customer relationships, 19 years for trade names, and 5 years for non-compete agreements. Zalk Steel was acquired to expand AZZ's existing footprint in the upper Midwest region of the United States. The goodwill arising from this acquisition was allocated to the Galvanizing Segment and is deductible for income tax purposes. Unaudited pro forma results of operations assuming the Zalk Steel acquisition had taken place at the beginning of each period are not provided because the historical operating results of Zalk Steel were not significant and pro forma results would not be significantly different from reported results for the periods presented.

Acquisitions

12 Months Ended

Feb. 28, 2017

On March 1, 2016, we 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.

Unaudited pro forma results of operations assuming the PEI acquisition had taken place at the beginning of each period are not provided because the historical operating results of PEI were not significant and pro forma results would not be significantly different from reported results for the periods presented.

On February 1, 2016, we completed our 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 Galvanizing 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 Galvanizing Segment and is deductible for income tax purposes.

Unaudited pro forma results of operations assuming the Alpha Galvanizing Inc. acquisition had taken place at the beginning of each period are not provided because the historical operating results of Alpha Galvanizing Inc. were not significant and pro forma results would not be significantly different from reported results for the periods presented.

On June 5, 2015, we 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 Galvanizing Segment and is deductible for income tax purposes.

Unaudited pro forma results of operations assuming the US Galvanizing, LLC acquisition had taken place at the beginning of each period are not provided because the historical operating results of US Galvanizing, LLC were not significant and pro forma results would not be significantly different from reported results for the periods presented.

On June 30, 2014, we completed our acquisition of substantially all the assets of Zalk Steel & Supply Co. (“Zalk Steel”), a Minneapolis, Minnesota-based galvanizing company, for a purchase price of $10.5 million and the assumption of $0.3 million in liabilities. The Company recorded $3.3 million of goodwill, which has been allocated to the Galvanizing Segment, and $3.4 million of intangible assets associated with this acquisition. The intangible assets associated with the acquisition consist primarily of trade names, customer relationships and non-compete agreements. These intangible assets are being amortized on a straight-line basis over a period of 19 years for customer relationships, 19 years for trade names, and 5 years for non-compete agreements. Zalk Steel was acquired to expand AZZ's existing footprint in the upper Midwest region of the United States. The goodwill arising from this acquisition was allocated to the Galvanizing Segment and is deductible for income tax purposes.

Unaudited pro forma results of operations assuming the Zalk Steel acquisition had taken place at the beginning of each period are not provided because the historical operating results of Zalk Steel were not significant and pro forma results would not be significantly different from reported results for the periods presented.