Through multiple acquisitions, we acquired definite-lived intangible assets consisting primarily of customer relationships, patented technology, distribution networks, and trademarks and trade names associated with specific products, which are amortized over their estimated useful lives. Indefinite-lived intangible assets consist of trade names that are expected to generate cash flows indefinitely.

We recorded amortization expense for definite-lived intangible assets of $20.0 million and $10.0 million during the three months ended May 31, 2025 and May 31, 2024, respectively, and $45.5 million and $29.9 million during the nine months ended May 31, 2025 and May 31, 2024, respectively. During the nine months ended May 31, 2025, we acquired goodwill and intangible assets as part of the QSC acquisition. Refer to Acquisitions footnote of the Notes to Consolidated Financial Statements for additional information.

The following table summarizes the changes in the carrying amount of goodwill by segment during the periods presented (in millions):


	Acuity Brands Lighting		Acuity Intelligent Spaces		Total
Balance at August 31, 2024	$	1,015.1	$	83.6	$	1,098.7
Provisional amounts from acquired business	—		363.5		363.5
Adjustments to provisional amounts from acquired businesses	—		31.5		31.5

Foreign currency translation adjustments	(0.3)		(0.8)		(1.1)
Balance at May 31, 2025	$	1,014.8	$	477.8	$	1,492.6


	Acuity Brands Lighting		Acuity Intelligent Spaces		Total
Balance at August 31, 2023	$	1,014.4	$	83.5	$	1,097.9



Foreign currency translation adjustments	(0.7)		(0.5)		(1.2)
Balance at May 31, 2024	$	1,013.7	$	83.0	$	1,096.7

Further discussion of goodwill and intangible assets is included within the Significant Accounting Policies footnote of the Notes to Consolidated Financial Statements within our Form 10-K.