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Employee Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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Sep. 30, 2013 Program | Sep. 30, 2012 | Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum participant contribution | 60.00% |  |
Minimum age for defined benefit plan | 55 years |  |
Defined contribution, matching percentage of participant's compensation | 0.667% |  |
Partnership aggregate contributions to defined contribution plans | $ 4,900,000 | $ 4,500,000 | $ 4,700,000
Number of 401 (k) plans | 2 |  |
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%
Defined benefit plan funded status included in other long-term liabilities | 4,300,000 | 12,700,000 |
Net actuarial loss balance in accumulated other comprehensive income to be amortized | 25,500,000 |  |
Amount to be amortized from accumulated other comprehensive income | 2,100,000 |  |
Rate pension plan assets expect to earn | 5.75% |  |
Discount rate to determine periodic pension expense | 3.50% | 4.35% | 4.70%
Expected Pension Contribution Next Year | 2,700,000 |  |
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 | 21,200,000 |  |
Domestic Fixed Income |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pension asset allocation | 80.00% |  |
International Equities |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pension asset allocation | 5.00% |  |
Domestic Equities |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pension asset allocation | 15.00% |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Participant Contribution | 0.00% |  |
Minimum Service Period for Defined Benefit Plans | 10 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Defined contribution, matching percentage of participant's compensation | 2.00% |  |
Frozen Defined Benefit Pension Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of frozen defined benefit pension plans | 2 |  |
Management |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
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% |  |
Management And General Partner |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Partnership incentive distribution | 330,000 | 277,000 | 261,000
Management Incentive Compensation Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Partnership incentive distribution | 165,000 | 138,000 | 130,000
Management Incentive Compensation Plan Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Partnership incentive distribution | $ 119,000 | $ 99,000 | $ 92,000
Core Contribution |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum participant contribution | 5.50% |  |
Core Contribution | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Participant Contribution | 4.00% |  |

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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 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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