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FAIR VALUE MEASUREMENTS
 12 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
The Company’s financial instruments are measured and reported at their estimated fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction. When available, the Company uses quoted prices in active markets to determine the fair values for its financial instruments (Level 1 inputs), or absent quoted market prices, observable market-corroborated inputs over the term of the financial instruments (Level 2 inputs). Level 3 inputs are unobservable inputs that are not corroborated by market data.

Recurring Fair Value Measurements
 
The following table summarizes the fair value hierarchy for each type of instrument carried at fair value on a recurring basis (in millions):

Fair Value Measurements at September 30, 2025
 
Total Carrying Value at September 30, 2025
Quoted Prices in Active Market
(Level One)		Significant Other Observable Inputs
(Level Two)		Significant Unobservable Inputs
(Level Three)
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)(b)
$3.5 $3.5 $— $— 
Derivatives designated as hedging instruments - natural gas instruments, net
7.9 — 7.9 — 
Total assets
$11.4 $3.5 $7.9 $— 
Liability Class:    
Derivatives designated as hedging instruments - natural gas instruments, net
$(8.7)$— $(8.7)$— 
Liabilities related to non-qualified savings plan(3.5)(3.5)— — 
Total liabilities
$(12.2)$(3.5)$(8.7)$— 
(a)Includes mutual fund investments of approximately 29% in the common stock of large-cap U.S. companies, 4% in the common stock of small to mid-cap U.S. companies, 2% in the common stock of international companies, 9% in bond funds, 20% in short-term investments and 36% in blended funds.
(b)The investments related to a non-qualified deferred compensation arrangement on behalf of certain members of management. The Company has a liability for the related-party transaction recorded in Other noncurrent liabilities for deferred compensation obligations.
Fair Value measurements at September 30, 2024
September 30, 2024Quoted Prices in Active Market
(Level One)		Significant Other Observable Inputs
(Level Two)		Significant Unobservable Inputs
(Level Three)
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)(b)
$3.1 $3.1 $— $— 
Derivatives not designated as hedging instruments - natural gas instruments, net
0.6 — 0.6 — 
Total assets
$3.7 $3.1 $0.6 $— 
Liability Class:
Derivatives designated as hedging instruments - natural gas instruments, net
$(1.9)$— $(1.9)$— 
Liabilities related to non-qualified savings plan(3.1)(3.1)— — 
Total liabilities
$(5.0)$(3.1)$(1.9)$— 
(a)Includes mutual fund investments of approximately 35% in the common stock of large-cap U.S. companies, 5% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 10% in bond funds, 5% in short-term investments and 40% in blended funds.
(b)The investments related to a non-qualified deferred compensation arrangement on behalf of certain members of management. The Company has a liability for the related-party transaction recorded in Other noncurrent liabilities for deferred compensation obligation.

Valuation Techniques: The Company holds marketable securities associated with its deferred contribution and pre-tax savings plans, which are valued based on readily available quoted market prices. The Company utilizes derivative instruments to manage its risk of changes in natural gas prices and foreign exchange rates (see Note 14. Derivative Financial Instruments). The fair values of the natural gas and foreign currency derivative instruments are determined using market data of forward prices for all of the Company’s contracts. 

Other Fair Value Measurements

The Company is required to disclose the fair value of financial instruments that are not recognized at fair value in the statement of financial position for which it is practicable to estimate that value (in millions):
Fair Value Measurements at September 30, 2025 Using
 
Total Carrying Value at
September 30, 2025
Quoted Prices in Active Market
(Level One)		Significant Other Observable Inputs
(Level Two)		Significant Unobservable Inputs
(Level Three)
8.00% Senior Notes due June 2030
$650.0 $— $680.1 $— 
6.75% Senior Notes due December 2027
150.0 — 150.1 — 

Fair Value Measurements at September 30, 2024 Using
 Total Carrying Value at
September 30, 2024		Quoted Prices in Active Market
(Level One)		Significant Other Observable Inputs
(Level Two)		Significant Unobservable Inputs
(Level Three)
Term Loan and Revolving Credit Facility
$383.9 $— $379.1 $— 
6.75% Senior Notes due December 2027
500.0 — 497.0 — 

Valuation Techniques: Observable market-based inputs were used to estimate fair value for Level 2 inputs, based on available trading information. Cash and cash equivalents, receivables (net of allowance for doubtful accounts) and accounts payable are carried at cost, which approximates fair value due to their liquid and short-term nature.
The following fair value hierarchy table summarizes the Company’s assets that were written down to their fair value on a nonrecurring basis (in millions):

Fair Value Measurements at the Measurement Date Using
 Measurement DateTotal Carrying Value at
Measurement Date		Quoted Prices in Active Market
(Level One)		Significant Other Observable Inputs
(Level Two)		Significant Unobservable Inputs
(Level Three)		Total Gains (Losses)
Intangible assets, net
Definite-lived intangible assets(a)
March 31, 2025$— $— $— $— $(53.0)
Definite-lived intangible assets(b)
March 22, 2024$— $— $— $— $(15.6)
Indefinite-lived intangible assets(c)
September 3, 2024$— $— $— $— $(17.6)
Property, plant, and equipment, net
Property, plant and equipment, net(d)
June 30, 2025$— $— $— $— $(0.7)
Property, plant and equipment, net(e)
January 23, 2024$— $— $— $— $(74.8)
Goodwill
Plant Nutrition goodwill(f)
March 31, 2024$— $— $— $— $(51.0)
Fortress goodwill(f)
March 31, 2024$— $— $— $— $(32.0)
(a)     On March 31, 2025, the Company recorded an impairment loss of $53.0 million related to definite-lived intangible asset after determining that no future cash flows were expected from these assets. As a result, the Fortress definite-lived intangible asset was assigned a fair value of zero using the income approach under ASC 820. Fair Value Measurement (see Note 2. Summary of Significant Accounting Policies).
(b)    On March 22, 2024, the Company recorded an impairment loss of $15.6 million related to definite-lived intangible asset associated with the magnesium chloride-related assets as a result of the evaluation using the income approach.
(c)    On September 3, 2024, the Company recorded an impairment loss of $17.6 million related to definitive-lived intangible asset water right, due to the Voluntary Agreement of donating non-production related water rights to be used by the State of Utah for lake conservation and preservation.
(d)    On June 30, 2025, Fortress-related property, plant and equipment, net with a carrying value of $0.7 million was written down to its fair value of $0, resulting in a loss on impairment, net of $0.7 million, due to no future expected use of property, plant and equipment, net at June 30. 2025.
(e)    On January 23, 2024, the Company terminated its pursuit of its lithium development. Consequently, the Company evaluated the capitalized assets, including site preparation, project engineering, equipment and material and capitalized labor and interest and recorded an impairment charge of $74.8 million.
(f)    On March 31, 2024, the Company performed the interim goodwill impairment test related to the Company’s Plant Nutrition segment, primarily due to decreases in projected future revenues and cash flows and an increase in discount rates due to the uncertain regulatory environment in Utah and recorded a goodwill impairment of $51.0 million. Following the impairment charge, there was no remaining goodwill balance for the Plant Nutrition reporting unit.
(g)     On March 31, 2024, the Company recorded a goodwill impairment loss of $32.0 million related to the Company’s Fortress reporting unit included in the Corporate and Other segment, primarily due to the changes in assumptions surrounding the magnesium chloride-based fire retardants which impacted projected future revenues and cash flows. Following the impairment charges, there was no remaining goodwill balance for the Fortress reporting unit.

In connection with the aforementioned impairments, the Company determined the estimated fair value for each reporting unit based on discounted cash flow projections (income approach), market values for comparable assets (market approach) or a combination of both. Under the income approach, the Company is required to make judgments about appropriate discount rates, long-term revenue growth rates and the amount and timing of expected future cash flows. The cash flows used in its estimates are based on the reporting unit's forecast, long-term business plan, and recent operating performance. Discount rate assumptions are based on an assessment of the risk inherent in the future cash flows of the respective reporting unit and market conditions. The Company’s estimates may differ from actual future cash flows. The risk adjusted discount rate used is consistent with the weighted average cost of capital of the Company’s peer companies and is intended to represent a rate of return that would be expected by a market participant. Under the market approach, market multiples are derived from market prices of stocks of companies in the Company’s peer group. The appropriate multiple is applied to the forecasted revenue and earnings before interest, taxes, depreciation and amortization of the reporting unit to obtain an estimated fair value.
The most critical assumptions used in the calculation of the fair value of each reporting unit are the projected revenue growth rates, long-term operating margin, terminal growth rates, discount rate, and the selection of market multiples. The projected long term operating margin utilized in the Company’s fair value estimates is consistent with its operating plan and is dependent on the successful execution of its long-term business plan, overall industry growth rates and the competitive environment. In many of these estimates, the cash flows were zero due to the exiting of these businesses, and therefore, the estimations were limited. The discount rate could be adversely impacted by changes in the macroeconomic environment and volatility in the equity and debt markets. Although management believes its estimate of fair value is reasonable, if the future financial performance falls below expectations or there are unfavorable revisions to significant assumptions, or if the Company’s market capitalization declines, an additional non-cash goodwill or long-lived asset impairment charge may be required in a future period.