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Fair Value of Financial Instruments - Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Apr. 29, 2018 | Apr. 01, 2018 | Apr. 30, 2017 | May 01, 2016 | May 03, 2015
--- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
goodwill | $ 13,569 |  | $ 11,462 | $ 11,462 | $ 11,462
Read Window Products LLC [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
goodwill |  | $ 2,107 |  |  |
Inventory |  | 1,128 |  |  |
Equipment |  | 379 |  |  |
Liabilities measured at fair value on a nonrecurring basis | 0 |  |  |  |
Read Window Products LLC [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
goodwill | 2,107 |  |  |  |
Inventory | 1,128 |  |  |  |
Read Window Products LLC [Member] | Customer Relationships [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Customer Relationships |  | 2,247 |  |  |
Read Window Products LLC [Member] | Customer Relationships [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Customer Relationships | 2,247 |  |  |  |
Read Window Products LLC [Member] | Trade Names [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Tradename | 683 | $ 683 |  |  |
Read Window Products LLC [Member] | Trade Names [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Tradename | 683 |  |  |  |
Equipment [Member] | Read Window Products LLC [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equipment | 379 |  |  |  |
Quoted prices in active markets for identical assets - Level 1 [Member] | Read Window Products LLC [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value on a nonrecurring basis | 0 |  |  |  |
Significant other observable inputs - Level 2 [Member] | Read Window Products LLC [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value on a nonrecurring basis | 0 |  |  |  |
Significant unobservable inputs - Level 3 [Member] | Read Window Products LLC [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value on a nonrecurring basis | 0 |  |  |  |
Significant unobservable inputs - Level 3 [Member] | Read Window Products LLC [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
goodwill | 2,107 |  |  |  |
Inventory | 1,128 |  |  |  |
Significant unobservable inputs - Level 3 [Member] | Read Window Products LLC [Member] | Customer Relationships [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Customer Relationships | 2,247 |  |  |  |
Significant unobservable inputs - Level 3 [Member] | Read Window Products LLC [Member] | Trade Names [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Tradename | 683 |  |  |  |
Significant unobservable inputs - Level 3 [Member] | Equipment [Member] | Read Window Products LLC [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equipment | $ 379 |  |  |  |

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