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Fair Value Measurements - Fair Value Assets Measured on a Non-recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation plan assets $ 1,445 $ 1,114 $ 1,080
Development projects in progress   3,791  
Land held for sale   325  
Fair Value, Measurements, Recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation plan assets 0 0 0
Development projects in progress   0  
Land held for sale   0  
Fair Value, Measurements, Recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation plan assets 1,445 1,114 1,080
Development projects in progress   0  
Land held for sale   0  
Fair Value, Measurements, Recurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation plan assets 0 0 0
Development projects in progress   3,791  
Land held for sale   $ 325  
Fair Value, Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Land held for sale 642   325
Fair Value, Measurements, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Land held for sale 0   0
Fair Value, Measurements, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Land held for sale 0   0
Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Land held for sale $ 642   $ 325