Parent Financial Statements - Balance Sheets (Parenthetical) (Detail) - $ / shares	Jun. 30, 2016	Sep. 30, 2015
Members' capital, par value
Members' capital, units issued	25,410,851	25,410,851
Members' capital, units outstanding	25,410,851	25,410,851
Parent Company [Member]
Members' capital, par value
Members' capital, units issued	25,410,851	25,410,851
Members' capital, units outstanding	25,410,851	25,410,851