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Commitments and Contingencies (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 16, 2016 | Oct. 01, 2014 | Apr. 27, 2014 | May 01, 2016 | May 03, 2015 | Apr. 27, 2014
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Rental expense for operating leases |  |  |  | $ 3,000,000 | $ 2,900,000 | $ 2,700,000
Future minimum rental commitments for noncancellable operating leases in fiscal 2017 |  |  |  | 2,600,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2018 |  |  |  | 1,200,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2019 |  |  |  | 405,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2020 |  |  |  | 48,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2021 |  |  |  | $ 18,000 |  |
Minimum [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms |  |  |  | 5 years |  |
Lease terms, renewal options for additional periods |  |  |  | 9 years |  |
Mattress Fabrics [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms |  | 3 years |  |  |  |
Monthly lease payments of a plant facility |  | $ 13,000 |  |  |  | 12,704
Mattress Fabrics [Member] | Plant facility [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Rental payments |  |  |  | $ 156,000 | 155,000 | 152,000
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Open purchase commitments |  |  |  | 10,600,000 | $ 2,300,000 |
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | buildings and improvements [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Open purchase commitments |  |  |  | $ 9,300,000 |  |
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | buildings and improvements [Member] | Subsequent Event [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Contractual obligation, estimated cost | $ 11,200,000 |  |  |  |  |
Contractual obligation due in remainder of fiscal year | 1,900,000 |  |  |  |  |
Contractual obligation due in fiscal 2017 | 4,300,000 |  |  |  |  |
Contractual obligation due in fiscal 2018 | 3,800,000 |  |  |  |  |
Contractual obligation due in fiscal 2019 | $ 1,200,000 |  |  |  |  |
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | buildings and improvements [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Percentage rate added to variable rate | 2.25% |  |  |  |  |
Variable interest rate | 30 day LIBOR rate |  |  |  |  |
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | buildings and improvements [Member] | Subsequent Event [Member] | Letter of Credit [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Letter of credit | $ 5,000,000 |  |  |  |  |
Unused fee calculated on letter of credit | 0.10% |  |  |  |  |
Mattress Fabrics [Member] | First Lease Renewal Term [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms, renewal options for additional periods |  | 3 years |  |  |  |
Monthly lease payments of a plant facility |  | $ 13,100 |  |  |  |
Mattress Fabrics [Member] | Second Lease Renewal Term [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms, renewal options for additional periods |  | 3 years |  |  |  |
Monthly lease payments of a plant facility |  | $ 13,200 |  |  |  |
Settled Litigation [Member] | Environmental Issue [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lawsuit filing date |  |  |  | February 5, 2008 |  |
Payments made for settlement of lawsuit |  |  | $ 206,000 |  |  |
Lawsuit dismissed date |  |  |  | Jun. 05, 2014 |  |
Settled Litigation [Member] | Environmental Issue [Member] | Other Expense [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Charge resulted from settlement of lawsuit |  |  |  |  |  | $ 206,000
Settled Litigation [Member] | Environmental Issue [Member] | Site of former manufacturing plant in West Hazleton, Pennsylvania [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Actions taken by court which impacted the lawsuit |  |  |  | The lawsuit involved court judgments that have been entered against the plaintiffs and against defendant Chromatex, Inc. requiring them to pay costs incurred by the United States Environmental Protection Agency ("USEPA") responding to environmental contamination at the Site, in amounts approximating $14 million, plus unspecified future environmental costs. |  |
Amount of judgment against plaintiffs for which recovery is being sought from defendants |  |  |  | $ 14,000,000 |  |
Damages sought by plaintiffs |  |  |  | Costs incurred by the United States Environmental Protection Agency ("USEPA") responding to environmental contamination at the Site, in amounts approximating $14 million, plus unspecified future environmental costs |  |

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