Significant Accounting Policies - Revenue Recognition and Other Licensing Matters (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Payments for Software to be Sold	$ 9	$ 90

The cash outflow associated with development of computer software product to be sold, leased, or otherwise marketed prior to achievement of technological feasibility.

No definition available.

Name:	azpn_PaymentsForSoftwareToBeSold
Namespace Prefix:	azpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration