CREDIT LINE AND NOTES - 6.00% Convertible Senior Notes (Details) shares in Millions		3 Months Ended	6 Months Ended
Feb. 19, 2015 USD ($) d shares	Dec. 26, 2015 USD ($)	Dec. 26, 2015 USD ($)	Jun. 27, 2015 USD ($)
Debt Instrument [Line Items]
Net carrying value of the liability component		$ 61,652,000	$ 61,652,000	$ 61,246,000
Convertible Notes \| 6.00% Convertible Senior Notes due 2020
Debt Instrument [Line Items]
Fixed interest rate	6.00%	6.00%	6.00%
Percentage of stock price the Notes were sold	100.00%
Proceeds from the sale of convertible notes, net	$ 61,600,000
Offering expenses	$ 600,000
Interest expense		$ 1,200,000	$ 2,400,000
Interest payments			1,900,000
Number of threshold trading days \| d	20
Consecutive trading days	30 days
Threshold trading days	5 days
Threshold percentage of stock price trigger	130.00%
Redemption price, percentage	100.00%
Number of additional shares that can be converted \| shares	11.2
Contingent obligation for the make-whole premiums	$ 0	0	0
Principal value of the liability component	65,000,000	65,000,000	65,000,000	65,000,000
Unamortized value of the debt discount and issuance costs	$ (3,400,000)	(3,348,000)	(3,348,000)	(3,754,000)
Net carrying value of the liability component		61,652,000	61,652,000	$ 61,246,000
Convertible Notes \| 6.00% Convertible Senior Notes due 2020 \| Convertible Notes
Debt Instrument [Line Items]
Unamortized value of the debt discount and issuance costs		(2,800,000)	(2,800,000)
Debt issuance costs		$ 500,000	$ 500,000

Debt Instrument, Converted Instrument, Additional Shares for Issuance, Maximum

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Debt Instrument, Convertible, Contingent Liability, Fair Value

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Debt Instrument, Offering Expenses

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Debt Instrument, Percentage of Stock Price

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Debt Instrument, Threshold Trading Days

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to interest.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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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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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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