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Net Periodic Benefit Cost for Period Reconciliation of Changes in Plan Assets Projected Benefit Obligations and Amounts Recognized in Other Comprehensive Income and Accumulated Other Comprehensive Income (Detail) - Frozen Defined Benefit Pension Plans - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Net Periodic Pension Cost in Income Statement      
Net Periodic Pension Cost in Income Statement, Interest cost $ 2,279 $ 2,251 $ 2,622
Net Periodic Pension Cost in Income Statement, Actual return on plan assets 942 (1,473) (8,595)
Net Periodic Pension Cost in Income Statement, Investment and other expenses (394) (455) (362)
Net Periodic Pension Cost in Income Statement, Difference between actual and expected return on plan assets (3,705) (1,232) 5,579
Net Periodic Pension Cost in Income Statement, Anticipated expenses 328 341 319
Net Periodic Pension Cost in Income Statement, Amortization of unrecognized net actuarial loss 1,791 2,131 2,591
Net Periodic Pension Cost in Income Statement, Annual cost/change 1,241 1,563 2,154
Cash      
Cash, Employer contributions/ Annual cost/change (1,653) (505) (17)
Fair Value of Pension Plan Assets      
Fair Value of Pension Plan Assets, Beginning Balance 65,676 68,276 63,788
Fair Value of Pension Plan Assets, Actual return on plan assets (942) 1,473 8,595
Fair Value of Pension Plan Assets, Employer contributions 1,653 505 17
Fair Value of Pension Plan Assets, Benefit payments (4,463) (4,578) (4,124)
Fair Value of Pension Plan Assets, Annual cost/change (3,752) (2,600) 4,488
Fair Value of Pension Plan Assets, Ending Balance 61,924 65,676 68,276
Projected Benefit Obligation      
Projected Benefit Obligation, Beginning balance (65,781) (70,679) (67,121)
Projected Benefit Obligation, Interest cost (2,279) (2,251) (2,622)
Projected Benefit Obligation, Benefit payments 4,463 4,578 4,124
Projected Benefit Obligation, Investment and other expenses 394 455 362
Projected Benefit Obligation , Anticipated expenses (328) (341) (319)
Projected Benefit Obligation, Actuarial gain (loss) 3,989 2,457 (5,103)
Projected Benefit Obligation, Annual cost/change 6,239 4,898 (3,558)
Projected Benefit Obligation, Ending balance (59,542) (65,781) (70,679)
Funded status at the end of the year 2,382 (105) (2,403)
Other Comprehensive (Income) / Loss      
Other Comprehensive (Income) / Loss, Difference between actual and expected return on plan assets 3,705 1,232 (5,579)
Other Comprehensive (Income) / Loss, Actuarial gain (loss) (3,989) (2,457) 5,103
Other Comprehensive (Income) / Loss, Amortization of unrecognized net actuarial loss (1,791) (2,131) (2,591)
Other Comprehensive (Income) / Loss, Annual cost/change (2,075) (3,356) (3,067)
Gross Pension Related Accumulated Other Comprehensive Income      
Gross Pension Related Accumulated Other Comprehensive Income, Beginning Balance 18,348 21,704 24,771
Other Comprehensive (Income) / Loss, Annual cost/change (2,075) (3,356) (3,067)
Gross Pension Related Accumulated Other Comprehensive Income, Ending Balance $ 16,273 $ 18,348 $ 21,704