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Loans Payable and Long-Term Debt (Narrative) (Details) |  |  |  |  |  |  | 2 Months Ended | 12 Months Ended | 28 Months Ended | 60 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Feb. 28, 2018 USD ($) | Feb. 26, 2018 USD ($) | Dec. 29, 2017 USD ($) | Jan. 25, 2016 USD ($) | Jun. 29, 2018 USD ($) | Apr. 30, 2018 USD ($) group | Dec. 31, 2005 loan | Apr. 30, 2015 USD ($) lease | Apr. 30, 2018 USD ($) lease | Feb. 12, 2018 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Non-Employee Director Groups | group |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Total Secured Debt To EBITDA Ratio |  |  |  |  |  |  |  | 2.50 |  |  |  |  |  |
Debt, outstanding balance |  |  |  |  |  |  |  | $ 828,344,000 |  |  | $ 828,344,000 |  |  |
New Markets Tax Credit Investment |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |
New Markets Tax Credit, Recapture Period |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  | $ 14,304,000 |  |  | 14,304,000 |  |  |
Deferred Finance Costs, Amortization Period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR rate |  |  |  |  |  | 1.20% |  |  |  |  |  |  |  |
Loan agreement amount |  |  |  |  |  | $ 6,600,000 |  |  |  |  |  |  |  |
Loan term |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |
Deferred Finance Costs, Amortization Period |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes, Loans and Financing Receivable, Net, Noncurrent |  |  |  |  |  | $ 4,300,000 |  |  |  |  |  |  |  |
Long-term Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn on loan |  |  |  |  |  |  |  | $ 6,700,000 |  |  | 6,700,000 |  | $ 5,900,000 |
Subordinated Promissory Notes Payable To Certain Current And Former RSI Employees [Member] | Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan agreement amount |  |  |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |
Loan term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Initial Term Loan [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | 230,000,000 |  |  | 230,000,000 |  |  |
Loan agreement amount |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
Delayed Draw Term Loan [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | $ 230,000,000 |  |  | $ 230,000,000 |  |  |
Loan agreement amount |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |
Allegany County, Maryland Site [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  | 3.00% |  |  | 3.00% |  |  |
Debt, outstanding balance |  |  |  |  |  |  |  | $ 2,200,000 |  |  | $ 2,200,000 |  |  |
Number of loan agreements | loan |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
First American Financial Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of capitalized lease agreements | lease |  |  |  |  |  |  |  |  |  |  | 12 |  |  |
Capital lease obligations incurred |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
Capital lease term |  |  |  |  |  |  |  | 48 months |  |  |  |  |  |
Capital lease agreement |  |  |  |  |  |  |  | $ 900,000 |  |  | 900,000 |  | 1,400,000 |
e-Plus Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of capitalized lease agreements | lease |  |  |  |  |  |  |  |  |  | 19 |  |  |  |
Capital lease obligations incurred |  |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |  |
Number Of Leases | lease |  |  |  |  |  |  |  |  |  | 15 |  |  |  |
Capital lease term |  |  |  |  |  |  |  |  |  | 51 months |  |  |  |
Number Of Leases 2 | lease |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Capital Lease Term 2 |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |
Capital lease agreement |  |  |  |  |  |  |  | $ 2,200,000 |  |  | $ 2,200,000 |  | 1,000,000 |
West Virginia Economic Development Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  | 2.00% |  |  | 2.00% |  |  |
Debt, outstanding balance |  |  |  |  |  |  |  | $ 3,800,000 |  |  | $ 3,800,000 |  | $ 4,400,000 |
Capital lease agreement |  |  |  |  |  |  |  | 10,000,000 |  |  | 10,000,000 |  |  |
West Virginia Economic Development Authority, Originated in 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Debt, outstanding balance |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |
West Virginia Economic Development Authority, Originated in 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00%
Debt, outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000
4.875% Senior Notes Due 2026 [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | $ 350,000,000 |  |  | $ 350,000,000 |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.875% |  |
Loan agreement amount |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |
RSI Notes [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  | $ 10,900,000 | $ 115,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  | $ 449,100,000 |  |
Long-term Debt, Fair Value |  |  |  |  | $ 602,300,000 |  |  |  |  |  |  |  |  |
Minimum [Member] | Subordinated Promissory Notes Payable To Certain Current And Former RSI Employees [Member] | Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 1.01% |  |  |  |  |  |  |  |  |
Minimum [Member] | First American Financial Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market interest rate |  |  |  |  |  |  |  | 3.50% |  |  | 3.50% |  |  |
Minimum [Member] | e-Plus Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market interest rate |  |  |  |  |  |  |  | 3.50% |  |  | 3.50% |  |  |
Maximum [Member] | Subordinated Promissory Notes Payable To Certain Current And Former RSI Employees [Member] | Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 2.12% |  |  |  |  |  |  |  |  |
Maximum [Member] | First American Financial Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market interest rate |  |  |  |  |  |  |  | 6.50% |  |  | 6.50% |  |  |
Maximum [Member] | e-Plus Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market interest rate |  |  |  |  |  |  |  | 6.50% |  |  | 6.50% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |
Required minimum ratio of cash flow to fixed charges under agreement |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |
Applicable Funded Debt To EBITDA Ratio |  |  |  |  |  |  |  | 3.75 |  |  |  |  |  |
Total Secured Debt To EBITDA Ratio |  |  |  |  |  |  |  | 1.87 |  |  |  |  |  |
Proceeds from term loan |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |
Total Funded Debt To EBITDA Ratio |  |  |  |  |  |  |  | 3.25 |  |  |  |  |  |
Revolving Credit Facility [Member] | Wells Fargo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility, Agreement Terminated |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio cash flow to fixed charges |  |  |  |  |  |  |  | 312.00% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on interest rate |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on interest rate |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
Scenario, Forecast [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable Funded Debt To EBITDA Ratio | 3.25 | 3.50 |  |  |  |  |  |  |  |  |  |  |  |
LEVEL 2 [Member] | 4.875% Senior Notes Due 2026 [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  |  |  |  |  |  | $ 339,000,000 |  |  | $ 339,000,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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