Financial Instruments and Fair Value Measurements - Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Institutional money market investments	$ 1,065,629	$ 590,515
Forward exchange contracts	17,197	37,198
Interest rate swap	2,353	5,959
Total Assets	1,085,179	633,672
Forward exchange contracts	16,563	39,589
Commodity forward contracts	1,666
Interest rate swaps		69,103
Contingent consideration liabilities	20,261
Total Liabilities	38,490	108,692
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Institutional money market investments	1,065,629	590,515
Total Assets	1,065,629	590,515
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward exchange contracts	17,197	37,198
Interest rate swap	2,353	5,959
Total Assets	19,550	43,157
Forward exchange contracts	16,563	39,589
Commodity forward contracts	1,666
Interest rate swaps		69,103
Total Liabilities	18,229	108,692
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liabilities	20,261
Total Liabilities	$ 20,261