Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	May 03, 2020	Apr. 28, 2019
Premier Money Market Fund [Member]
Assets:
Investments at fair value	$ 7,496	$ 6,639
Short Term Bond Funds [Member]
Assets:
Investments at fair value	923
Growth Allocation Fund [Member]
Assets:
Investments at fair value	219	203
Moderate Allocation Fund [Member]
Assets:
Investments at fair value	63	127
Other [Member]
Assets:
Investments at fair value	56	112
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member]
Assets:
Investments at fair value	7,496	6,639
Quoted prices in active markets for identical assets - Level 1 [Member] | Short Term Bond Funds [Member]
Assets:
Investments at fair value	923
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member]
Assets:
Investments at fair value	219	203
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member]
Assets:
Investments at fair value	63	127
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]
Assets:
Investments at fair value	$ 56	$ 112