Earnings Per Share - Additional Information (Detail) - shares	Sep. 30, 2016	Sep. 30, 2015
Employee Stock Option [Member]
Schedule Of Earnings Per Share [Line Items]
Potentially dilutive securities	1,838,000	2,360,000
Restricted Stock [Member]
Schedule Of Earnings Per Share [Line Items]
Potentially dilutive securities	304,667	34,000
Equity Option [Member]
Schedule Of Earnings Per Share [Line Items]
Potentially dilutive securities	300,000	0

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration