Quarterly report pursuant to Section 13 or 15(d)

Debt - Interest Rate Contracts (Details)

v3.19.2
Debt - Interest Rate Contracts (Details) - Cash Flow Hedging - Designated as Hedging Instrument - Interest rate swap contracts - USD ($)
9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2018
Derivative [Line Items]    
Pay fixed swaps - notional amount $ 300,000,000 $ 343,750,000
Net unrealized gain $ 775,000 $ 11,309,000
Weighted-average maturity period (years) 2 years 2 months 12 days 2 years 8 months 12 days
Weighted-average received rate (as a percent) 2.40% 2.26%
Weighted-average pay rate (as a percent) 1.40% 1.37%