Pension and Post-Retirement Benefit Obligations (Details) (USD $)	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Change in benefit obligation:
Aggregate pension and post-retirement deficit	$ 591,900,000		$ 591,900,000		$ 221,300,000
Long-term portion of the aggregate pension and post-retirement deficit	578,874,000		578,874,000		220,742,000
United States Pension Plan of US Entity, Defined Benefit
Components of net periodic (benefit) cost:
Service costs	1,700,000		3,200,000
Interest cost on projected benefit obligation	7,200,000	1,900,000	13,600,000	3,800,000
Expected return on plan assets	(7,600,000)	(2,100,000)	(14,300,000)	(4,200,000)
Amortization of net loss	1,100,000	1,000,000	2,200,000	2,000,000
Net periodic cost	2,400,000	800,000	4,700,000	1,600,000
Change in benefit obligation:
Employer contributions			21,300,000
Expected employer contributions in next fiscal year	8,300,000
Foreign Pension Plan, Defined Benefit
Components of net periodic (benefit) cost:
Service costs	200,000	200,000	500,000	400,000
Interest cost on projected benefit obligation	11,600,000	7,000,000	22,900,000	13,800,000
Expected return on plan assets	(12,200,000)	(6,500,000)	(24,100,000)	(12,900,000)
Amortization of prior service cost		(100,000)	(100,000)	(100,000)
Amortization of net loss	1,500,000	1,200,000	3,000,000	2,400,000
Settlement loss recognized			400,000
Net periodic cost	1,100,000	1,800,000	2,600,000	3,600,000
Change in benefit obligation:
Employer contributions			11,300,000
Expected employer contributions in next fiscal year	$ 11,900,000

This represents the entire liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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The amount of gains or losses recognized in net periodic benefit cost.

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

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

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