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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, 2015
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Pension Plan Assets, Beginning Balance $ 65,379 $ 60,028 $ 60,303
Net Periodic Pension Cost in Income Statement, Interest cost 2,762 2,761 2,477
Net Periodic Pension Cost in Income Statement, Actual return on plan assets (679) (7,614) (332)
Net Periodic Pension Cost in Income Statement, Investment and other expenses (577) (262) (285)
Net Periodic Pension Cost in Income Statement, Difference between actual and expected return on plan assets (2,259) 4,472 (3,475)
Net Periodic Pension Cost in Income Statement, Anticipated expenses 327 300 302
Net Periodic Pension Cost in Income Statement, Amortization of unrecognized net actuarial loss 2,226 2,113 2,655
Net Periodic Pension Cost in Income Statement, Annual cost/change 1,800 1,770 1,342
Cash, Employer contributions/ Annual cost/change (1,743) (2,014) (3,476)
Fair Value of Pension Plan Assets, Actual return on plan assets 679 7,614 332
Fair Value of Pension Plan Assets, Employer contributions 1,743 2,014 3,476
Fair Value of Pension Plan Assets, Benefit payments (4,013) (4,277) (4,083)
Fair Value of Pension Plan Assets, Annual cost/change (1,591) 5,351 (275)
Fair Value of Pension Plan Assets, Ending Balance 63,788 65,379 60,028
Projected Benefit Obligation, Beginning balance (70,482) (64,305) (73,051)
Projected Benefit Obligation, Interest cost (2,762) (2,761) (2,477)
Projected Benefit Obligation, Benefit payments 4,013 4,277 4,083
Projected Benefit Obligation, Investment and other expenses 577 262 285
Projected Benefit Obligation , Anticipated expenses (327) (300) (302)
Projected Benefit Obligation, Actuarial gain (loss) 1,860 (7,655) 7,157
Projected Benefit Obligation , Annual cost/change 3,361 (6,177) 8,746
Projected Benefit Obligation, Ending balance (67,121) (70,482) (64,305)
Funded status at the end of the year (3,333) (5,103) (4,277)
Other Comprehensive (Income) / Loss, Difference between actual and expected return on plan assets 2,259 (4,472) 3,475
Other Comprehensive (Income) / Loss, Actuarial gain (loss) (1,860) 7,655 (7,157)
Other Comprehensive (Income) / Loss, Amortization of unrecognized net actuarial loss (2,226) (2,113) (2,655)
Other Comprehensive (Income) / Loss, Annual cost/change (1,827) 1,070 (6,337)
Gross Pension Related Accumulated Other Comprehensive Income, Beginning Balance 26,598 25,528 31,865
Other Comprehensive (Income) / Loss, Annual cost/change (1,827) 1,070 (6,337)
Gross Pension Related Accumulated Other Comprehensive Income, Ending Balance $ 24,771 $ 26,598 $ 25,528