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v3.22.2.2

Commitments and Contingencies - Operating leases and purchase obligations (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Purchase Obligations |  |  |
Purchase obligations on open purchase orders | $ 2,600,000 | $ 2,100,000 | $ 900,000
Product Liability |  |  |
Product liability insurance | $ 50,000,000 |  |

X
- References No definition available. + Details
Name: | issc_ProductLiabilityAbstract
Namespace Prefix: | issc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents amount of insurance which is adequate to cover potential liabilities that may arise from product liability claims. + References No definition available. + Details
Name: | issc_ProductLiabilityInsurance
Namespace Prefix: | issc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_PurchaseObligationFiscalYearMaturityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration