Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2017	Apr. 29, 2016	Apr. 24, 2015
Statement of Cash Flows [Abstract]
Net Income	$ 126,467	$ 24,222	$ 16,553
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	60,090	79,607	80,074
Impairments	15,256	8,384	8,861
(Gain) Loss on disposal of fixed assets	(168,859)	4,532	2,204
(Gain) Loss on rabbi trust assets	(1,691)	1,640	(742)
Loss (Gain) on deferred compensation	2,514	(765)	2,013
Share-based compensation	17,197	6,127	2,967
Accretion of non-current note receivable	(1,133)	(2,082)	(1,859)
Deferred income taxes	23,921	(28,384)	(14,791)
Amortization of deferred financing costs	4,201	2,188	1,099
Cash provided by (used for) assets and liabilities:
Accounts receivable	(2,700)	(2,793)	4,588
Inventories	(751)	(377)	623
Prepaid expenses and other current assets	(1,377)	483	(563)
Accounts payable	(10,281)	7,499	955
Federal and state income taxes	14,629	33,067	1,504
Accrued wages and related liabilities	(1,160)	(3,101)	11,005
Self-insurance	(1,474)	1,269	(974)
Accrued non-income taxes	(756)	745	(2,892)
Deferred revenue	(337)	433	747
Other assets and liabilities	(198)	(9,058)	(8,267)
Net cash provided by operating activities	73,558	123,636	103,105
Investing activities:
Purchase of property, plant and equipment	(65,768)	(65,694)	(74,517)
Proceeds from sale of property, plant and equipment	557,061	257,246	10,036
Proceeds from liquidation of rabbi trust assets	0	5,245	0
Deposits and other	330	(537)	(135)
Net cash provided by (used in) investing activities	491,623	196,260	(64,616)
Financing activities:
Cash dividends paid	(26,915)	(27,861)	(29,056)
Gross proceeds from credit facility borrowings and other long-term debt	413,268	672,349	579,895
Gross repayments of credit facility borrowings and other long-term debt	(750,668)	(783,339)	(588,541)
Payments of debt issuance costs	(1,542)	(3,555)	(1,279)
Purchase of treasury stock	0	(171,513)	0
Proceeds from share-based compensation	518	214	534
Cash paid for taxes on share-based compensation	(1,353)	(1,314)	(1,738)
Excess tax benefits from share-based compensation	(499)	1,661	228
Net cash (used in) financing activities	(367,191)	(313,358)	(39,957)
Net cash provided by (used in) operations	197,990	6,538	(1,468)
Cash and equivalents at the beginning of the period	12,896	6,358	7,826
Cash and equivalents at the end of the period	$ 210,886	$ 12,896	$ 6,358