Debt (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2011	Oct. 01, 2011
Debt Instrument [Line Items]
Long-term Debt	$ 106,987	$ 105,224
Convertible Notes Payable
Debt Instrument [Line Items]
Rate	0.875%
Conversion price	$ 14.355
Maturity date	Jun. 01, 2012
0.875% Convertible Subordinated Notes due June 2012	110,000	110,000
0.875% Convertible Subordinated Notes due June 2012, debt discount	$ (3,013)	$ (4,776)
Convertible Notes Payable \| Semi Annual Payment, First Payment
Debt Instrument [Line Items]
Payment date of each year	--06-01
Convertible Notes Payable \| Semi Annual Payment, Second Payment
Debt Instrument [Line Items]
Payment date of each year	--12-01

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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