XML 70 R40.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Fair Value Disclosures [Abstract]    
Long-term debt and finance leases, including current maturities, carrying value $ 821,773 $ 858,145
Long-term debt and finance leases, including current maturities, fair value $ 846,900 $ 882,700