Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Receivables, which includes tuition and notes receivable	$ 49,725	$ 53,144
Deferred revenue	$ 42,616	40,694
Disaggregation of Revenue [Line Items]
Percentage of students not returned to campus	1.00%
Percentage of students completing catch up labs	18.00%
Deferred revenue	$ 42,616	$ 40,694
Students
Revenue from Contract with Customer [Abstract]
Deferred revenue	2,000
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 2,000

Amount, after allowance for credit loss, of accounts and financing receivable. Includes, but is not limited to, notes and loan receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_AccountsAndNotesReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant