Financial Instruments and Fair Value Measurements - Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Assets
Institutional money market investments	$ 1,165,990	$ 1,065,629
Forward exchange contracts	20,175	17,197
Interest rate swap	193	2,353
Commodity forward contracts	1,312
Total Assets	1,187,670	1,085,179
Liabilities
Forward exchange contracts	15,955	16,563
Commodity forward contracts		1,666
Contingent consideration liabilities	29,414	20,261
Total Liabilities	45,369	38,490
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Institutional money market investments	1,165,990	1,065,629
Forward exchange contracts
Interest rate swap
Commodity forward contracts
Total Assets	1,165,990	1,065,629
Liabilities
Forward exchange contracts
Commodity forward contracts
Contingent consideration liabilities
Total Liabilities
Significant Other Observable Inputs (Level 2) [Member]
Assets
Institutional money market investments
Forward exchange contracts	20,175	17,197
Interest rate swap	193	2,353
Commodity forward contracts	1,312
Total Assets	21,680	19,550
Liabilities
Forward exchange contracts	15,955	16,563
Commodity forward contracts		1,666
Contingent consideration liabilities
Total Liabilities	15,955	18,229
Significant Unobservable Inputs (Level 3) [Member]
Assets
Institutional money market investments
Forward exchange contracts
Interest rate swap
Commodity forward contracts
Total Assets
Liabilities
Forward exchange contracts
Commodity forward contracts
Contingent consideration liabilities	29,414	20,261
Total Liabilities	$ 29,414	$ 20,261

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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