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Long-Term Debt and Lines of Credit - Long-Term Debt Narrative (Detail) (USD $)					0 Months Ended	3 Months Ended		0 Months Ended	12 Months Ended	3 Months Ended
	Jul. 29, 2012	Apr. 29, 2012	Jul. 29, 2012 Unsecured senior term notes [Member]	Apr. 29, 2012 Unsecured senior term notes [Member]	Aug. 11, 2011 Unsecured senior term notes [Member] Bodet And Horst [Member]	Jul. 29, 2012 Unsecured senior term notes [Member] Bodet And Horst [Member]	Aug. 11, 2008 Unsecured senior term notes [Member] Bodet And Horst [Member]	Aug. 11, 2012 Unsecured senior term notes [Member] Bodet And Horst [Member] Long-term Debt [Member]	Aug. 11, 2012 Unsecured senior term notes [Member] Bodet And Horst [Member] Long-term Debt [Member]	Jul. 29, 2012 Government Of Quebec Term Loan [Member]	Apr. 29, 2012 Government Of Quebec Term Loan [Member]	Dec. 01, 2009 Government Of Quebec Term Loan [Member] Installment
Debt Instrument [Line Items]
Issuance of unsecured term notes							$ 11,000,000
Fixed interest rate							8.01%
Term of the note agreement						Seven years
Required amount of principal payment installments						2,200,000
Date of first required principal payment						Aug. 11, 2011				Dec. 01, 2009
Required debt payment frequency						Annual				Monthly
Average term period for principal payments, in years						3 years
Maturity date						Aug. 11, 2015
Principal payment paid					2,200,000			2,200,000	4,400,000
Unsecured senior term notes outstanding	9,066,000	9,123,000	8,800,000	8,800,000				6,600,000	6,600,000	266,000	323,000
Number of equal installment payments required from loan inception												48
Principal payment requirements of long-term debt for the first year	2,400,000
Principal payment requirements of long-term debt for the second year	2,300,000
Principal payment requirements of long-term debt for the third year	2,200,000
Principal payment requirements of long-term debt for the fourth year	2,200,000
Long-term debt, fair value	$ 8,000,000	$ 8,100,000

X

- Definition

The average term period for principal payments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of required installment payments under the terms of a loan.

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- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Interest rate stated in the contractual debt agreement.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Amount of the required periodic payments applied to principal.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt 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.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next rolling twelve months following the latest balance sheet presented.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth rolling twelve months following the latest balance sheet presented.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third rolling twelve months following the latest balance sheet presented.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second rolling twelve months following the latest balance sheet presented.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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