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OPERATING SEGMENTS (Tables)
 12 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Schedule of Segment Information
Segment information is as follows (in millions):
Fiscal Year Ended September 30, 2025
SaltPlant Nutrition
Corporate & Other(a)
Total
Sales to external customers(b)
$1,022.5 $206.3 $15.1 $1,243.9 
Intersegment sales— 12.5 (12.5)— 
Shipping and handling cost312.5 30.7 0.1 343.3 
Product cost
533.0 164.4 12.5 709.9 
Gross profit
177.0 11.2 2.5 190.7 
Selling, general and administrative expenses(e)
30.5 4.7 78.1 113.3 
Loss on impairments(c)
— — 53.7 53.7 
Other operating (income) expense(d)
0.6 — (2.2)(1.6)
Operating income (loss)
145.9 6.5 (127.1)25.3 
Depreciation, depletion and amortization70.9 28.4 3.9 103.2 
Total assets1,038.8 363.7 116.9 1,519.4 
Capital expenditures53.3 12.2 4.2 69.7 
Fiscal Year Ended September 30, 2024
SaltPlant Nutrition
Corporate & Other(a)
Total
Sales to external customers(b)
$907.8 $181.0 $28.6 $1,117.4 
Intersegment sales— 8.0 (8.0)— 
Shipping and handling cost280.1 24.6 0.6 305.3 
Product cost
431.8 168.3 17.0 617.1 
Gross profit
195.9 (11.9)11.0 195.0 
Selling, general and administrative expenses(e)
31.3 5.4 101.1 137.8 
Loss on impairments(c)
— 68.6 122.4 191.0 
Other operating (income) expense(d)
1.0 0.5 (18.5)(17.0)
Operating income (loss)
163.6 (86.4)(194.0)(116.8)
Depreciation, depletion and amortization63.4 34.1 7.5 105.0 
Total assets1,084.5 388.1 167.5 1,640.1 
Capital expenditures77.2 9.9 27.1 114.2 
 
Fiscal Year Ended September 30, 2023
SaltPlant Nutrition
Corporate & Other(a)
Total
Sales to external customers(b)
$1,010.8 $172.1 $21.8 $1,204.7 
Intersegment sales— 9.7 (9.7)— 
Shipping and handling cost324.5 21.4 0.2 346.1 
Product cost
481.3 134.2 11.1 626.6 
Gross profit
205.0 16.5 10.5 232.0 
Selling, general and administrative expenses(e)
34.5 7.0 108.7 150.2 
Other operating (income) expense(d)
— — 4.4 4.4 
Operating income (loss)
170.5 9.5 (102.6)77.4 
Depreciation, depletion and amortization58.5 32.9 7.2 98.6 
Total assets1,050.4 473.4 293.1 1,816.9 
Capital expenditures71.9 29.5 52.9 154.3 
Schedule of Disaggregated Revenue by Product Type
Disaggregated revenue by product type is as follows (in millions):
Fiscal Year Ended September 30, 2025
SaltPlant Nutrition
Corporate & Other(a)
Total
Highway Deicing Salt$642.7 $— $— $642.7 
Consumer & Industrial Salt379.8 — — 379.8 
SOP— 218.8 — 218.8 
Eliminations & Other— (12.5)15.1 2.6 
Sales to external customers$1,022.5 $206.3 $15.1 $1,243.9 
Fiscal Year Ended September 30, 2024
SaltPlant Nutrition
Corporate & Other(a)
Total
Highway Deicing Salt$546.4 $— $— $546.4 
Consumer & Industrial Salt361.4 — — 361.4 
SOP— 189.0 — 189.0 
Fire Retardant Products— — 14.2 14.2 
Revenue from Services— — 0.5 0.5 
Eliminations & Other— (8.0)13.9 5.9 
Sales to external customers$907.8 $181.0 $28.6 $1,117.4 

Fiscal Year Ended September 30, 2023
SaltPlant Nutrition
Corporate & Other(a)
Total
Highway Deicing Salt $641.7 $— $— $641.7 
Consumer & Industrial Salt369.1 — — 369.1 
SOP— 181.8 — 181.8 
Fire Retardant Products
——8.68.6 
Revenue from Services
——1.81.8 
Eliminations & Other— (9.7)11.4 1.7 
Sales to external customers$1,010.8 $172.1 $21.8 1,204.7 
(a)Corporate and Other includes corporate entities, records management operations, Fortress, equity method investments, prior year lithium-related costs and other incidental operations and eliminations. Operating income (loss) for corporate and other includes indirect corporate overhead, including costs for general corporate governance and oversight, prior year lithium-related expenses, as well as costs for the human resources, information technology, legal and finance functions.
(b)Sales to external customers are net of intersegment sales.
(c)The Company recorded loss on impairments of $53.7 million and $193.4 million (inclusive of the $2.4 million impairment of Fortress related inventory included in Product costs), for the fiscal years ended September 30, 2025 and September 30, 2024, respectively, which impacted operating results. Refer to Note 2. Summary of Significant Accounting Policies for additional information regarding the loss on impairments of Plant Nutrition, Fortress, and lithium development assets.
(d)Corporate and Other operating results were impacted by net gains of $7.9 million, $22.1 million and $0.8 million, recorded in Other operating (income) expense, related to the decline in the valuation of the Fortress contingent consideration for the fiscal years ended September 30, 2025, September 30, 2024 and September 30, 2023, respectively.
(e)The Company continued to take steps to align its cost structure to its current business needs. These initiatives impacted Corporate and Other operating results and resulted in net severance and related charges, excluding stock-based compensation forfeitures, for reductions in workforce, changes to executive leadership and additional restructuring costs related to the termination of the Company’s lithium development project recorded in Other operating (income) expense of $4.3 million, $15.8 million and $5.5 million for the fiscal years ended September 30, 2025, September 30, 2024 and September 30, 2023, respectively.
Schedule of Revenue and Long-Lived Assets by Geographic Area
Financial information relating to the Company’s operations by geographic area is as follows (in millions):
Fiscal Year Ended
SalesSeptember 30,
2025		September 30,
2024		September 30,
2023
United States(a)
$875.3 $825.0 $860.4 
Canada288.6 234.7 269.7 
United Kingdom65.9 50.7 66.1 
Other14.1 7.0 8.5 
Total sales$1,243.9 $1,117.4 $1,204.7 
(a)United States sales exclude product sold to foreign customers at U.S. ports.
Financial information relating to the Company’s long-lived assets, excluding the investments related to the non-qualified retirement plan and pension plan assets, by geographic area (in millions):
Long-Lived AssetsSeptember 30,
2025		September 30,
2024		September 30,
2023
United States$495.2 $580.9 $741.7 
Canada373.9 392.6 398.0 
United Kingdom66.9 67.5 64.2 
Other6.5 6.5 7.7 
Total long-lived assets$942.5 $1,047.5 $1,211.6