Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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

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

Net Income per Common Share - Additional Informations (Detail) - shares	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computations of diluted earnings per share	387,382	372,255
Class A Nonvoting Common Stock [Member]
Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computations of diluted earnings per share			751,200