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Pre Tax Charge associated with the unfavorable verdict returned against the company, in an antitrust and false advertising lawsuit filed by RTI Technologies .

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of damages awarded to the plaintiff in the legal matter.

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions					1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 15, 2015	Nov. 10, 2014	Sep. 19, 2013	Nov. 09, 2009	Apr. 30, 2015	Sep. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Loss Contingencies [Line Items]
Rental expense for operating leases							$ 89.0	$ 71.0	$ 70.0
Future minimum rental commitments on noncancelable leases due in 2016							80.0
Future minimum rental commitments on noncancelable leases due in 2017							62.0
Future minimum rental commitments on noncancelable leases due in 2018							36.0
Future minimum rental commitments on noncancelable leases due in 2019							26.0
Future minimum rental commitments on noncancelable leases due in 2020							18.0
Future minimum rental commitments on noncancelable leases thereafter							24.0
Aggregate future purchase commitments							$ 958.0
Anti-dumping measures, period					5 years
United States
Loss Contingencies [Line Items]
Duty percentage rate					45.30%
United Kingdom of Great Britain and Northern Ireland
Loss Contingencies [Line Items]
Duty percentage rate					71.50%
RTI Technologies
Loss Contingencies [Line Items]
Damages awarded	$ 341.0		$ 113.5	$ 5.0
Pre-tax charge relating to an unfavorable litigation verdict						$ 341.0
Percentage of reduction in total fee recovery		50.00%
Professional Fees	$ 12.0