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Fair Value Measurements - Reconciliation (Details) - Significant unobservable inputs (Level 3)
$ in Thousands
3 Months Ended
Jul. 27, 2019
USD ($)
Reconciliation between beginning and ending balances of items measured at fair value on recurring basis  
Business acquisition $ 4,263
Total gains (realized or unrealized) Included in selling, general and administrative 32
Balance at the end of the period $ 4,295