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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 17,637 $ 55,505 $ 26,900
Other comprehensive income:      
Unrealized gain on pension plan obligation [1] 1,170 2,075 3,356
Tax effect of unrealized gain on pension plan obligation (320) (625) (1,359)
Unrealized gain (loss) on captive insurance collateral 2,231 (1,204)  
Tax effect of unrealized gain (loss) on captive insurance collateral (473) 254  
Unrealized gain (loss) on interest rate hedge (1,993) 39  
Tax effect of unrealized gain (loss) on interest rate hedge 525 (10)  
Total other comprehensive income 1,140 529 1,997
Total comprehensive income $ 18,777 $ 56,034 $ 28,897
[1] These items are included in the computation of net periodic pension cost. See Note 14 - Employee Benefit Plans.