Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Leases, Operating [Abstract]
Standby letters of credit	$ 3.5	$ 3.9

The total amount of the contingent obligation under letters of credit issued in connection with certain facility leases outstanding as of the reporting date.

No definition available.

Name:	azpn_StandbyLettersOfCreditInConnectionWithFacilityLeases
Namespace Prefix:	azpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant