Employment Agreements and Retirement Plans - Additional Disclosures (Details)	12 Months Ended
	Sep. 30, 2018 age
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions matching vested in service	3 years
Contributions matching vested in pro rata basis	100.00%
Vesting period of Supplemental Executive Retirement Plan	3 years
SERP, percent vested per year	33.33%
SERP vesting in the event of the participant's death or disability or the termination of the plan due to a change in control	100.00%
SERP vesting In event of participant reaching retirement age, percentage	100.00%
SERP, retirement age	60
SERP vesting In event of participant reaching retirement age, years of service	5 years
Executive Officer
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Additional severance or change-in-control benefits, period of salary continuation	1 year