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Commitments and Contingencies (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 16, 2016 | Oct. 01, 2014 | Apr. 30, 2016 | Apr. 30, 2017 | May 01, 2016 | May 03, 2015
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Rental expense for operating leases |  |  |  | $ 2,900,000 | $ 3,000,000 | $ 2,900,000
Future minimum rental commitments for noncancellable operating leases in fiscal 2018 |  |  |  | 2,200,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2019 |  |  |  | 1,300,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2020 |  |  |  | 911,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2021 |  |  |  | 127,000 |  |
Future minimum rental commitments for noncancellable operating leases in fiscal 2022 |  |  |  | 78,000 |  |
Accounts payable for capital expenditures |  |  |  | 6,100,000 |  |
Accounts payable for capital expenditures, current |  |  |  | 4,767,000 | 224,000 |
Accounts payable for capital expenditures, noncurrent |  |  |  | 1,322,000 |  |
buildings and improvements [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Amount financed for construction of building |  |  |  | 5,100,000 |  |
Equipment [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Accounts payable for capital expenditures, current |  |  |  |  | 224,000 |
Mattress Fabrics [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms |  | 3 years |  |  |  |
Monthly lease payments of a plant facility |  | $ 13,000 |  |  |  |
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Open purchase commitments |  |  |  | 7,200,000 |  |
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | buildings and improvements [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Open purchase commitments |  |  |  | 5,100,000 |  |
Contractual obligation, current cost | $ 11,300,000 |  |  |  |  |
Contractual obligation paid |  |  | $ 1,900,000 | $ 4,300,000 |  |
Contractual obligation due in fiscal 2018 | 3,800,000 |  |  |  |  |
Contractual obligation due in fiscal 2019 | 1,300,000 |  |  |  |  |
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | buildings and improvements [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] | 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] | Plant facility [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Rental payments |  |  |  | $ 156,000 | $ 156,000 | $ 155,000
First Lease Renewal Term [Member] | Mattress Fabrics [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 |  |  |  |
Second Lease Renewal Term [Member] | Mattress Fabrics [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 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms |  |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Lease terms |  |  |  | 5 years |  |
Lease terms, renewal options for additional periods |  |  |  | 9 years |  |

X
- Definition The carrying value as of the balance sheet date of obligations incurred and payable for the purchase of a building and equipment. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of obligations incurred and payable for the purchase of a building and equipment that are to be repaid within one year. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of obligations incurred and payable for the purchase of a building and equipment that are to be repaid after one year. + References No definition available. + Details
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- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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- Definition Amount of contractual obligation 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 No definition available. + Details
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- Definition Amount of contractual obligation 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. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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- Definition This element represents the current and noncurrent portions of a long-term real estate loan with an initial maturity beyond one year or beyond the normal operating cycle, if longer, to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project (generally one to seven years), usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition The cash outflow from construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition Cash payments to lessor's for use of assets under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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- Details
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