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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, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair Value of Pension Plan Assets, Beginning Balance | $ 68,276 | $ 63,788 | $ 65,379
Net Periodic Pension Cost in Income Statement, Interest cost | 2,251 | 2,622 | 2,762
Net Periodic Pension Cost in Income Statement, Actual return on plan assets | (1,473) | (8,595) | (679)
Net Periodic Pension Cost in Income Statement, Investment and other expenses | (455) | (362) | (577)
Net Periodic Pension Cost in Income Statement, Difference between actual and expected return on plan assets | (1,232) | 5,579 | (2,259)
Net Periodic Pension Cost in Income Statement, Anticipated expenses | 341 | 319 | 327
Net Periodic Pension Cost in Income Statement, Amortization of unrecognized net actuarial loss | 2,131 | 2,591 | 2,226
Net Periodic Pension Cost in Income Statement, Annual cost/change | 1,563 | 2,154 | 1,800
Cash, Employer contributions/ Annual cost/change | (505) | (17) | (1,743)
Fair Value of Pension Plan Assets, Actual return on plan assets | 1,473 | 8,595 | 679
Fair Value of Pension Plan Assets, Employer contributions | 505 | 17 | 1,743
Fair Value of Pension Plan Assets, Benefit payments | (4,578) | (4,124) | (4,013)
Fair Value of Pension Plan Assets, Annual cost/change | (2,600) | 4,488 | (1,591)
Fair Value of Pension Plan Assets, Ending Balance | 65,676 | 68,276 | 63,788
Projected Benefit Obligation, Beginning balance | (70,679) | (67,121) | (70,482)
Projected Benefit Obligation, Interest cost | (2,251) | (2,622) | (2,762)
Projected Benefit Obligation, Benefit payments | 4,578 | 4,124 | 4,013
Projected Benefit Obligation, Investment and other expenses | 455 | 362 | 577
Projected Benefit Obligation , Anticipated expenses | (341) | (319) | (327)
Projected Benefit Obligation, Actuarial gain (loss) | 2,457 | (5,103) | 1,860
Projected Benefit Obligation , Annual cost/change | 4,898 | (3,558) | 3,361
Projected Benefit Obligation, Ending balance | (65,781) | (70,679) | (67,121)
Funded status at the end of the year | (105) | (2,403) | (3,333)
Other Comprehensive (Income) / Loss, Difference between actual and expected return on plan assets | 1,232 | (5,579) | 2,259
Other Comprehensive (Income) / Loss, Actuarial gain (loss) | (2,457) | 5,103 | (1,860)
Other Comprehensive (Income) / Loss, Amortization of unrecognized net actuarial loss | (2,131) | (2,591) | (2,226)
Other Comprehensive (Income) / Loss, Annual cost/change | (3,356) | (3,067) | (1,827)
Gross Pension Related Accumulated Other Comprehensive Income, Beginning Balance | 21,704 | 24,771 | 26,598
Other Comprehensive (Income) / Loss, Annual cost/change | (3,356) | (3,067) | (1,827)
Gross Pension Related Accumulated Other Comprehensive Income, Ending Balance | $ 18,348 | $ 21,704 | $ 24,771

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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