Interest Rate Derivatives (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 27, 2014	Apr. 28, 2013	Sep. 30, 2013
Interest Rate Derivatives
Derivative income	$ 398	$ 748
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(247)	(594)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(149)	(357)
Interest rate swap contracts
Interest Rate Derivatives
Aggregate notional value			50,000
Fair value of derivative liability		794
Amount of accumulated other comprehensive income (loss) related to interest rate swap contracts maturing within the next twelve months, net of tax	149	357
Derivative income	794	1,699
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	247	594
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	149	357
Derivative expense	$ (396)	$ (951)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payments on the derivative liability.

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The net gain (loss) included in earnings for the period relating to components of the gain (loss) on interest rate cash flow hedging instruments excluded from the assessment of fair value hedge effectiveness.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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