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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, 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