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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
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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

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