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Employee Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 Significant Other Observable Inputs Level 2 | Sep. 30, 2014 Significant Unobservable Inputs Level 3 | Sep. 30, 2014 Minimum | Sep. 30, 2014 Frozen Defined Benefit Pension Plans Program | Sep. 30, 2013 Frozen Defined Benefit Pension Plans | Sep. 30, 2012 Frozen Defined Benefit Pension Plans | Sep. 30, 2011 Frozen Defined Benefit Pension Plans | Sep. 30, 2014 Other Postretirement Benefit Plan, Defined Benefit | Sep. 30, 2013 Other Postretirement Benefit Plan, Defined Benefit | Sep. 30, 2012 Other Postretirement Benefit Plan, Defined Benefit | Sep. 30, 2014 Domestic Fixed Income | Sep. 30, 2014 International Equities | Sep. 30, 2014 Domestic Equities | Sep. 30, 2014 Management | Sep. 30, 2014 Management And General Partner | Sep. 30, 2013 Management And General Partner | Sep. 30, 2012 Management And General Partner | Sep. 30, 2014 Management Incentive Compensation Plan | Sep. 30, 2013 Management Incentive Compensation Plan | Sep. 30, 2012 Management Incentive Compensation Plan | Sep. 30, 2014 Management Incentive Compensation Plan Executive Officer | Sep. 30, 2013 Management Incentive Compensation Plan Executive Officer | Sep. 30, 2012 Management Incentive Compensation Plan Executive Officer | Sep. 30, 2014 Employee and Consultant | Sep. 30, 2014 Termination of employment or consultation | Sep. 30, 2014 Chief executive officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participant Contribution |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum participant contribution | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership aggregate contributions to defined contribution plans | $ 5,200,000 | $ 4,900,000 | $ 4,500,000 |  |  |  |  |  |  |  | $ 500,000 | $ 500,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive distribution percentage of available cash in excess of minimum quarterly distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Minimum quarterly distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0675 |  |  |  |  |  |  |  |  |  |  |  |
Gains interest cash proceeds percentage from the sale of general partner units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Participant's vested percentage of plan benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 20.00% | 33.333%
Partnership incentive distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 447,000 | 330,000 | 277,000 | 223,000 | 165,000 | 138,000 | 100,000 | 119,000 | 99,000 |  |  |
Maximum funded for red zone | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum funded for yellow zone | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum funded for green zone | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership contributions in excess of 5% of the plan's total contributions in percentage | 5.00% | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of frozen defined benefit pension plans |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan funded status included in other long-term liabilities | 5,100,000 | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss balance in accumulated other comprehensive income to be amortized | 26,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to be amortized from accumulated other comprehensive income | 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate pension plan assets expect to earn | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate to determine periodic pension expense | 4.45% | 3.50% | 4.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension asset allocation |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% | 5.00% | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Fair values of the Partnership's pension plan assets |  |  |  | 0 | 0 |  | 65,379,000 | 60,028,000 | 60,303,000 | 52,434,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Pension Contribution Next Year | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected benefit payments in years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected benefit payments over the next 5 years | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate expected benefit payment for five years thereafter | $ 21,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + 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 (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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