Goodwill - Narrative (Details)	3 Months Ended
Sep. 30, 2018 triggering_event
Goodwill and Intangible Assets Disclosure [Abstract]
Number of triggering events	0

Represents the number of triggering events indicating goodwill impairment occurring during the period.

No definition available.

Name:	azpn_GoodwillImpairmentNumberOfTriggeringEvents
Namespace Prefix:	azpn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration