Earnings per Share - Additional Information (Details) - shares	3 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive potential common shares	40,000	40,000	40,000	40,000
Series A Cumulative Convertible Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Convertible preferred stock (in shares)	36,000	36,000	36,000	36,000