The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands			6 Months Ended
	Dec. 01, 2020	Apr. 01, 2020	Jun. 30, 2021
Series of Individually Immaterial Business Acquisitions
Payments to acquire businesses, gross			$ 110,790
Analytical Graphics, Inc.
Payments to acquire businesses, gross	$ 720,600
Percentage of shares acquired	100.00%
Lumerical
Payments to acquire businesses, gross		$ 107,500
Percentage of shares acquired		100.00%