Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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EMPLOYEE STOCK PLANS - 2009 Stock Plan (Details) - shares				12 Months Ended
	Apr. 25, 2018	Apr. 26, 2017	Apr. 23, 2015	Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of equity awards granted				10 years
Equity award vesting period				4 years
2009 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares of common stock reserved for issuance (in shares)	4,000,000	1,500,000	2,500,000
Shares reserved for issuance (in shares)				16,500,000
Term of equity awards granted				10 years
Period 1 \| 2009 Stock Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting percentage				25.00%
Equity award vesting period				1 year
Period 1 \| 2009 Stock Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting percentage				25.00%
Equity award vesting period				1 year
Period 2 \| 2009 Stock Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting percentage				2.08333%
Period 2 \| 2009 Stock Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting percentage				12.50%