Acquisitions Acquisitions and Strategic Agreements (MBS Details) (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 28, 2018	Apr. 29, 2017
Business Acquisition, Pro Forma Revenue		$ 2,247,825
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		34,091
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		(2,630)
Business Acquisition, Pro Forma Net Income (Loss)		$ 32,055
Goodwill, Purchase Accounting Adjustments	$ 1,163
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	888
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities	275
MBS [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred		$ 187,862
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		1,171
Business Combination, Consideration Transferred, Liabilities Incurred		15,556
Business Combination, Consideration Transferred, Other		(21,674)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other		472
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		28,177
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory		128,431
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		12,403
Finite-lived Intangible Assets Acquired		21,576
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets		4,748
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		195,807
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable		35,383
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		8,799
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		13,045
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		57,227
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		138,580
Goodwill, Acquired During Period		49,282
Goodwill, Purchase Accounting Adjustments	$ 1,163
Cash paid to seller or escrow [Member] \| MBS [Member]
Payments to Acquire Businesses, Gross		165,499
Consideration to seller for pre-closing costs [Member] \| MBS [Member]
Payments to Acquire Businesses, Gross		4,657
Cash paid for seller closing costs [Member] \| MBS [Member]
Payments to Acquire Businesses, Gross		4,044
contract purchase price [Member] \| MBS [Member]
Payments to Acquire Businesses, Gross		174,200
Payment to settle Seller's outstanding short-term borrowings [Member] \| MBS [Member]
Payments to Acquire Businesses, Gross		24,437
Off-Market Favorable Lease [Member] \| MBS [Member]
Finite-lived Intangible Assets Acquired		$ 1,076
Finite-Lived Intangible Asset, Useful Life		6 years 6 months
Trade Names [Member] \| MBS [Member]
Finite-lived Intangible Assets Acquired		$ 3,500
Finite-Lived Intangible Asset, Useful Life		10 years
Technology-Based Intangible Assets [Member] \| MBS [Member]
Finite-lived Intangible Assets Acquired		$ 1,500
Finite-Lived Intangible Asset, Useful Life		3 years
Book Store Relationship [Member] \| MBS [Member]
Finite-lived Intangible Assets Acquired		$ 13,000
Finite-Lived Intangible Asset, Useful Life		13 years
Customer Relationships [Member] \| MBS [Member]
Finite-lived Intangible Assets Acquired		$ 2,000
Finite-Lived Intangible Asset, Useful Life		15 years
Noncompete Agreements [Member] \| MBS [Member]
Finite-lived Intangible Assets Acquired		$ 500
Finite-Lived Intangible Asset, Useful Life		3 years

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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Amount of assets acquired at the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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