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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 $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Frozen Defined Benefit Pension Plans
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Pension Plan Assets, Beginning Balance $ 60,028,000 $ 60,303,000 $ 52,434,000
Net Periodic Pension Cost in Income Statement, Interest cost 2,761,000 2,477,000 2,858,000
Net Periodic Pension Cost in Income Statement, Actual return on plan assets (7,614,000) (332,000) (8,727,000)
Net Periodic Pension Cost in Income Statement, Investment and other expenses (262,000) (285,000) (374,000)
Net Periodic Pension Cost in Income Statement, Difference between actual and expected return on plan assets 4,472,000 (3,475,000) 5,075,000
Net Periodic Pension Cost in Income Statement, Anticipated expenses 300,000 302,000 262,000
Net Periodic Pension Cost in Income Statement, Amortization of unrecognized net actuarial loss 2,113,000 2,655,000 2,751,000
Net Periodic Pension Cost in Income Statement, Annual cost/change 1,770,000 1,342,000 1,845,000
Cash, Employer contributions/ Annual cost/change (2,014,000) (3,476,000) (3,365,000)
Fair Value of Pension Plan Assets, Actual return on plan assets 7,614,000 332,000 8,727,000
Fair Value of Pension Plan Assets, Employer contributions 2,014,000 3,476,000 3,365,000
Fair Value of Pension Plan Assets, Benefit payments (4,277,000) (4,083,000) (4,223,000)
Fair Value of Pension Plan Assets, Annual cost/change 5,351,000 (275,000) 7,869,000
Fair Value of Pension Plan Assets, Ending Balance 65,379,000 60,028,000 60,303,000
Projected Benefit Obligation, Beginning balance (64,305,000) (73,051,000) (67,878,000)
Projected Benefit Obligation, Interest cost (2,761,000) (2,477,000) (2,858,000)
Projected Benefit Obligation, Benefit payments 4,277,000 4,083,000 4,223,000
Projected Benefit Obligation, Investment and other expenses 262,000 285,000 374,000
Projected Benefit Obligation , Anticipated expenses (300,000) (302,000) (262,000)
Projected Benefit Obligation, Actuarial gain (loss) (7,655,000) 7,157,000 (6,650,000)
Projected Benefit Obligation , Annual cost/change (6,177,000) 8,746,000 (5,173,000)
Projected Benefit Obligation, Ending balance (70,482,000) (64,305,000) (73,051,000)
Funded status at the end of the year (5,103,000) (4,277,000) (12,748,000)
Other Comprehensive (Income) / Loss, Difference between actual and expected return on plan assets (4,472,000) 3,475,000 (5,075,000)
Other Comprehensive (Income) / Loss, Actuarial gain (loss) 7,655,000 (7,157,000) 6,650,000
Other Comprehensive (Income) / Loss, Amortization of unrecognized net actuarial loss (2,113,000) (2,655,000) (2,751,000)
Other Comprehensive (Income) / Loss, Annual cost/change 1,070,000 (6,337,000) (1,176,000)
Gross Pension Related Accumulated Other Comprehensive Income, Beginning Balance 25,528,000 31,865,000 33,041,000
Gross Pension Related Accumulated Other Comprehensive Income, Annual cost/change 1,070,000 (6,337,000) (1,176,000)
Gross Pension Related Accumulated Other Comprehensive Income, Ending Balance $ 26,598,000 $ 25,528,000 $ 31,865,000