Amounts payable to customers at the balance sheet date. The term customers generally excludes other broker-dealers; persons who are principal officers, directors, and stockholders; and persons whose securities or funds are part of the regulatory net capital of the broker-dealer. Another broker-dealer's account can be classified as a customer if the account is carried as an omnibus account in compliance with certain regulations. The accounts of principal officers, directors and stockholders may be combined in the customer captions if they are not material and the combination is disclosed in the oath that is required to accompany the annual audited FOCUS Report.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Rule 15c3
-Number 240
-Section 1
-Paragraph 1
-Article 15c3
-Subsection c

Name:	us-gaap_PayablesToCustomers
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended	9 Months Ended
	Apr. 29, 2016	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Basis Of Presentation [Line Items]
Royalty and license fee	$ 2,900	$ 10,556	$ 7,908		$ 25,207	$ 22,566
Royalty payment period					2009 through fiscal 2016
Payables to customers		1,741			$ 1,741		$ 63
Out of Period Royalty Adjustment [Member]
Basis Of Presentation [Line Items]
Royalty and license fee					1,100
Prior Year Period Royalty Adjustment [Member]
Basis Of Presentation [Line Items]
Royalty and license fee				$ 1,000
Settlement Agreement [Member]
Basis Of Presentation [Line Items]
Payables to customers		$ 1,400			$ 1,400