Operations and assets by segment.

No definition available.

Name:	azz_OperationsAndAssetsBySegmentAbstract
Namespace Prefix:	azz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Payments To Acquire Property, Plant, Equipment And Acquire Businesses, Net Of Cash

+ References

No definition available.

+ Details

Name:	azz_PaymentsToAcquirePropertyPlantEquipmentAndAcquireBusinessesNetOfCash
Namespace Prefix:	azz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_Assets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=azz_EnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=azz_GalvanizingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=azz_OtherCountriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Operating segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Operating segments (Details) - USD ($) $ in Thousands	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Operations and assets by segment
Revenue, Net	$ 202,548	$ 239,516	$ 222,787	$ 262,236	$ 200,660	$ 208,158	$ 196,329	$ 205,283	$ 927,087	$ 810,430	$ 863,538
Operating Income (Loss)									76,956	48,248	98,908
Depreciation									50,245	50,526	50,357
Payments to acquire property, plant, equipment and acquire businesses, net of cash									33,616	74,397	64,113
Assets	1,088,570				1,028,209				1,088,570	1,028,209
Property, Plant and Equipment, Net	210,227				216,855				210,227	216,855
Energy [Member]
Operations and assets by segment
Revenue, Net									486,823	421,033	488,002
Operating Income (Loss)									31,332	(1,766)	52,577
Depreciation									19,405	19,996	19,624
Payments to acquire property, plant, equipment and acquire businesses, net of cash									14,608	32,903	31,474
Assets	630,134				554,866				630,134	554,866
Galvanizing Services [Member]
Operations and assets by segment
Revenue, Net									440,264	389,397	375,536
Operating Income (Loss)									83,591	84,332	79,033
Depreciation									29,124	28,617	28,650
Payments to acquire property, plant, equipment and acquire businesses, net of cash									16,046	39,474	32,099
Assets	440,090				460,575				440,090	460,575
Corporate, Non-Segment [Member]
Operations and assets by segment
Operating Income (Loss)									(37,967)	(34,318)	(32,702)
Depreciation									1,716	1,913	2,083
Payments to acquire property, plant, equipment and acquire businesses, net of cash									2,962	2,020	540
Assets	18,346				12,768				18,346	12,768
UNITED STATES
Operations and assets by segment
Revenue, Net									785,194	653,150	705,820
Property, Plant and Equipment, Net	189,281				194,418				189,281	194,418
Non-US [Member]
Operations and assets by segment
Property, Plant and Equipment, Net	3,985				4,183				3,985	4,183
CANADA
Operations and assets by segment
Property, Plant and Equipment, Net	$ 16,961				$ 18,254				16,961	18,254
Other Countries [Member]
Operations and assets by segment
Revenue, Net									$ 141,893	$ 157,280	$ 157,718