Contract Liabilities and Other Disclosures (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2018
Contract Liabilities and Other Disclosures (Textual)
Revenue recognized in deferred income	$ 2.7	$ 9.6	$ 7.7

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

No definition available.

Name:	inse_RevenueRecognizedInDeferredIncome
Namespace Prefix:	inse_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration