Employee Retirement Plans (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial losses	$ (7.8)
Amortization of prior service credits	0.2
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans	33.9	29.5
Net cost to sponsor unfunded and non-qualified supplemental executive retirement plans	3.0	3.0	3.0
Amounts recorded in UGI's stockholders include pre-tax losses representing unrecognized actuarial losses	(9.4)	(11.0)
Amount of expected amortization of pre-tax actuarial losses into retiree benefit cost	0.6
Percentage of Aggregate Employer Securities Holdings to Not to Exceed Fair Value Assets	10.00%
Percentage of UGI Common Stock represented Pension Plan Assets	8.20%	7.50%
Cost of benefits under the 401(k) savings plan	14.0	13.7	10.4
U.S Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
ABO for the Pension Plans	451.3	496.4
Contribution made to Pension Plan	22.4	31.2	18.7
Expected contribution to pensions plans in next twelve months	18
Pension and Other Postretirement Benefit Contributions, Fair Value	398.2	351.5
Fiscal 2017 [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed domestic health care cost range	7.00%
Fiscal 2019 [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed domestic health care cost range	7.50%
Fiscal 2019 [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed domestic health care cost range	5.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefit Contributions	0
Pension and Other Postretirement Benefit Contributions, Fair Value	23.7	2.0
Portion used to fund company established trusts [Member] \| Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefit Contributions	$ 0

Defined benefit plan future amortization of actuarial gains losses.

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- Definition

Net costs for unfunded and non-qualified supplemental executive retirement plans.

+ References

No definition available.

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Percentage of aggregate employer securities holdings to not to exceed fair value assets.

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Net costs for unfunded and non qualified supplemental executive retirement plans.

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- Definition

Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans.

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No definition available.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

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The employer's best estimate, as soon as it can be reasonably determined, 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. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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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.

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- Definition

The ultimate trend rate for health care costs.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

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