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Weighted-Average Assumptions Used in Measurement of Partnership's Benefit Obligation (Detail)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]      
Discount rate at year end date 4.05% 4.45% 3.50%
Expected return on plan assets for the year ended 5.75% 7.00% 7.75%
Rate of compensation increase 0.00% 0.00% 0.00%