Operating Leases (Details) (USD $)	12 Months Ended
Apr. 25, 2015	Apr. 26, 2014	Apr. 27, 2013
Operating Leases
Total rent liability	$ 13,500,000us-gaap_AccruedRentNoncurrent	$ 12,800,000us-gaap_AccruedRentNoncurrent
Future minimum rentals for all non-cancelable operating leases
2016	55,576,000
2017	54,587,000
2018	51,775,000
2019	46,212,000
2020	40,015,000
2021 and beyond	115,902,000
Total Future Minimum Rentals	364,067,000
Future rental income from subleases
2016	4,394,000
2017	4,160,000
2018	4,101,000
2019	4,104,000
2020	4,132,000
2021 and beyond	8,756,000
Total Future Minimum Income	29,647,000
Rental expense and rental income for operating leases
Rental expense	55,808,000	51,132,000	47,872,000
Rental income	$ 4,966,000	$ 5,138,000	$ 5,095,000

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Amount of minimum sublease rentals to be received maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of minimum sublease rentals to be received maturing in the fourth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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No definition available.

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Amount of minimum sublease rentals to be received maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.

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Amount of minimum sublease rentals to be received maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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No definition available.

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Amount of minimum sublease rentals to be received maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms excess of one year.

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No definition available.

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Amount of minimum sublease rentals to be received maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for contractual rent under lease arrangements.

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-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.5-02.24)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 24

-Article 5

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 2

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

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