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Contingencies (Details) - Delta - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Feb. 23, 2017
Contingencies
Amount paid		$ 7,750
Reversal of reserve	$ 3,600

X

- Definition

Amount paid towards reversal of reserve and collection of the unbilled receivables.

+ References

No definition available.

+ Details

Name:	issc_UnbilledReceivablesAmountPaid
Namespace Prefix:	issc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of reversal of reserves created under unbilled receivables.

+ References

No definition available.

+ Details

Name:	issc_UnbilledReceivablesReversalOfReserve
Namespace Prefix:	issc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CounterpartyNameAxis=issc_DeltaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: