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Debt (Narratives) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | May 18, 2023 | Mar. 31, 2023
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 175,000,000 |
Outstanding borrowings |  | $ 512,560,000 |  | $ 512,560,000 |  |  |
Current portion of long-term debt and finance lease obligations |  | 50,636,000 |  | 50,636,000 |  |  | $ 40,604,000
Deferred Costs |  | 7,845,000 |  | 7,845,000 |  |  | 6,323,000
Accumulated Amortization, Deferred Finance Costs |  | 2,356,000 |  | 2,356,000 |  |  | 1,815,000
Unsecured credit lines |  | $ 2,326,000 |  | 2,326,000 |  |  |
Amount drawn on unsecured credit lines |  |  |  | 0 |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ (2,859,000) | $ 0 |  |
Lessee, Finance Lease, Term of Contract |  | 23 years |  | 23 years |  |  |
Operating Income (Loss) |  | $ 33,351,000 | $ 27,372,000 | $ 54,799,000 | 50,191,000 |  |
Short-term Debt |  | 50,000,000 |  | 50,000,000 |  |  |
Debt Instrument, Periodic Payment, Principal |  | 25,000,000 |  |  |  |  |
Debt Instrument, Periodic Payment |  | 3,058,000 |  |  |  |  |
Debt Instrument, Increase (Decrease), Other, Net | $ 75,000,000 |  |  |  |  |  |
Amortization of Intangible Assets |  | 7,508,000 | $ 6,447,000 | 14,385,000 | $ 12,982,000 |  |
Accounts Receivable, after Allowance for Credit Loss, Current |  | 166,390,000 |  | 166,390,000 |  |  | 151,451,000
Line of Credit Facility, Increase (Decrease), Net |  |  |  | 75,000,000 |  |  |
UNITED STATES |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Current |  | 80,078,000 |  | 80,078,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Accumulated Amortization, Deferred Finance Costs |  | 2,116,000 |  | 2,116,000 |  |  | 1,611,000
Deferred Costs, Noncurrent |  | 4,828,000 |  | 4,828,000 |  |  | 4,027,000
Required payments [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Current portion of long-term debt and finance lease obligations |  | 6,116,000 |  | 6,116,000 |  |  |
Secured Debt | Asset-Backed Securities, Securitized Loans and Receivables |  |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |  |
Long-term Debt |  | 45,000,000 |  | 45,000,000 |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 55,000,000 |  | 55,000,000 |  |  |
Accumulated Amortization, Deferred Finance Costs |  | 60,000 |  | 60,000 |  |  |
Long-term Debt |  | 45,000,000 |  | 45,000,000 |  |  |
Debt Issuance Costs, Gross |  | 536,000 |  | 536,000 |  |  |
Secured Debt | Loans [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  | 2,414,000 |  | 2,414,000 |  |  | $ 892,000
New Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Outstanding letters of credit |  | 15,719,000 |  | 15,719,000 |  |  |
Increase in Deferred Costs, Noncurrent |  |  |  | 801,000 |  |  |
New Revolving Credit Facility | Standby Letters of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Outstanding letters of credit |  | 15,525,000 |  | 15,525,000 |  |  |
New Revolving Credit Facility | Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Outstanding letters of credit |  | 194,000 |  | 194,000 |  |  |
New Revolving Credit Facility | Unsecured Lines of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 12,847,000 |  | 12,847,000 |  |  |
Outstanding borrowings |  | $ 10,239,000 |  | $ 10,239,000 |  |  |

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4531-111522 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of deferred cost, excluding capitalized cost related to contract with customer; classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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- Definition Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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