Acquisitions Acquisition (Details) - USD ($)	9 Months Ended	12 Months Ended
	Jan. 27, 2018	Apr. 29, 2017
Student Brands LLC [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred	$ 61,997,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	4,626,000
Finite-lived Intangible Assets Acquired	28,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	1,593,000
Goodwill, Acquired During Period	31,782,000
MBS [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Other		$ 21,674,000
Business Combination, Consideration Transferred, Liabilities Incurred		$ 15,556,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities	275
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred		$ 187,862,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		1,000
Finite-lived Intangible Assets Acquired		21,576,000
Goodwill, Acquired During Period		49,281,000
Goodwill, Purchase Accounting Adjustments	1,163
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	888
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other		472,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		28,177,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory		128,431,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		12,403,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets		4,748,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		195,807,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable		35,383,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		8,799,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		13,044,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		57,226,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		138,581,000
Off-Market Favorable Lease [Member] | MBS [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 1,076,000
Finite-Lived Intangible Asset, Useful Life		6 years 6 months
Book Store Relationship [Member] | MBS [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 13,000,000
Finite-Lived Intangible Asset, Useful Life		13 years
Customer Relationships [Member] | MBS [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 2,000,000
Finite-Lived Intangible Asset, Useful Life		15 years
Trade Names [Member] | MBS [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 3,500,000
Finite-Lived Intangible Asset, Useful Life		10 years
Media Content [Member] | Student Brands LLC [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 14,500,000
Finite-Lived Intangible Asset, Useful Life	5 years
Technology-Based Intangible Assets [Member] | Student Brands LLC [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 8,000,000
Finite-Lived Intangible Asset, Useful Life	5 years
Technology-Based Intangible Assets [Member] | MBS [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 1,500,000
Finite-Lived Intangible Asset, Useful Life		3 years
Noncompete Agreements [Member] | Student Brands LLC [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 4,000,000
Finite-Lived Intangible Asset, Useful Life	3 years
Noncompete Agreements [Member] | MBS [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 500,000
Finite-Lived Intangible Asset, Useful Life		3 years
Customer Lists [Member] | Student Brands LLC [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,800,000
Finite-Lived Intangible Asset, Useful Life	2 years
Cash paid to seller or escrow [Member] | MBS [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 165,499,000
Consideration to seller for pre-closing costs [Member] | MBS [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		4,657,000
Cash paid for seller closing costs [Member] | MBS [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		4,044,000
contract purchase price [Member] | MBS [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		174,200,000
Payment to settle Seller's outstanding short-term borrowings [Member] | MBS [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 24,437,000