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Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail)
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]    
Weighted average rates 3.16% 3.07%
Minimum [Member]    
Debt Instrument [Line Items]    
Range of effective rates 2.12% 2.37%
Maximum [Member]    
Debt Instrument [Line Items]    
Range of effective rates 5.50% 5.25%