Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets - Foreign currency forwards	$ 660	[1]
Financial Assets - Trading securities held in deferred compensation plan	8,755	[2]
Financial Assets - Total	9,415
Financial Liabilities - Foreign currency forwards	238	[1]
Financial Liabilities - Interest rate swaps	728	[3]
Financial Liabilities - Phantom stock plan	4,569	[4]
Financial Liabilities - Deferred compensation plan	8,755	[5]
Financial Liabilities - Total	14,290
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets - Trading securities held in deferred compensation plan	8,755	[2]
Financial Assets - Total	8,755
Financial Liabilities - Deferred compensation plan	8,755	[5]
Financial Liabilities - Total	8,755
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets - Foreign currency forwards	660	[1]
Financial Assets - Total	660
Financial Liabilities - Foreign currency forwards	238	[1]
Financial Liabilities - Interest rate swaps	728	[3]
Financial Liabilities - Phantom stock plan	4,569	[4]
Financial Liabilities - Total	$ 5,535

[1] Based on internally-developed models that use as their basis readily observable market parameters such as current spot and forward rates, and the LIBOR index.

[2] Based on the observable price of publicly traded mutual funds which are classified as trading securities and accounted for using the mark-to-market method.

[3] Measured as the present value of all expected future cash flows based on the LIBOR-based swap yield curve as of September 30, 2012. The present value calculation uses discount rates that have been adjusted to reflect the credit quality of the Company and its counterparties.

[4] Based on the price of the Company's common stock.

[5] Based on the fair value of the investments in the deferred compensation plan.