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Long-Term Debt - Narrative (Details) AUD in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 29, 2015 USD ($) | Oct. 01, 2017 USD ($) Institution | Apr. 30, 2017 AUD | Apr. 30, 2016 AUD | May 07, 2013 USD ($)
Long-term debt |  |  |  |  |
Number of banks with whom entity entered into agreement | Institution |  | 4 |  |  |
Amount outstanding under credit facility |  | $ 356,400,000 |  |  |
Credit Agreement |  |  |  |  |
Long-term debt |  |  |  |  |
Maximum borrowing capacity | $ 654,800,000 |  |  |  |
Term of borrowings | 5 years |  |  |  |
Borrowings outstanding |  | $ 356,400,000 |  |  |
Weighted-average interest rate (as a percent) |  | 2.45% |  |  |
Weighted-average rate including the effects of interest rate swap agreement (as a percent) |  | 2.65% |  |  |
Consolidated leverage ratio |  | 1.62 |  |  |
Consolidated fixed charge coverage ratio |  | 2.27 |  |  |
Credit Agreement | Maximum |  |  |  |  |
Long-term debt |  |  |  |  |
Covenant maximum consolidated leverage ratio | 3.00 |  |  |  |
Credit Agreement | Minimum |  |  |  |  |
Long-term debt |  |  |  |  |
Covenant minimum consolidated fixed charge coverage ratio | 1.25 |  |  |  |
Credit Agreement | Base rate |  |  |  |  |
Long-term debt |  |  |  |  |
Margin spread on variable rate basis, low end of the range (as a percent) | 0.15% |  |  |  |
Margin spread on variable rate basis, high end of the range (as a percent) | 1.00% |  |  |  |
Credit Agreement | Base rate | U.S. federal funds base rate |  |  |  |  |
Long-term debt |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.50% |  |  |  |
Interest rate basis | U.S. federal funds rate |  |  |  |
Credit Agreement | Base rate | Eurocurrency base rate |  |  |  |  |
Long-term debt |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |  |
Interest rate basis | Eurocurrency rate |  |  |  |
Credit Agreement | Base rate | Bank's prime rate |  |  |  |  |
Long-term debt |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |  |
Interest rate basis | bank's prime rate |  |  |  |
Credit Agreement | Eurocurrency rate | Eurocurrency base rate |  |  |  |  |
Long-term debt |  |  |  |  |
Margin spread on variable rate basis, low end of the range (as a percent) | 1.15% |  |  |  |
Margin spread on variable rate basis, high end of the range (as a percent) | 2.00% |  |  |  |
Interest rate basis | Eurocurrency rate |  |  |  |
Credit facility. |  |  |  |  |
Long-term debt |  |  |  |  |
Maximum borrowing capacity | AUD |  |  | AUD 30 | AUD 30 |
Amount outstanding under credit facility |  | $ 0 |  |  |
Standby letters of credit under letter of credit agreements |  |  |  |  |
Long-term debt |  |  |  |  |
Letters of credit outstanding |  | 23,900,000 |  |  |
Term loan facility |  |  |  |  |
Long-term debt |  |  |  |  |
Maximum borrowing capacity | $ 194,800,000 |  |  |  | $ 205,000,000
Principal payment due in year 1 | 10,300,000 |  |  |  |
Principal payment in year 2 | 15,400,000 |  |  |  |
Principal payment in year 3 | 15,400,000 |  |  |  |
Principal payment in year 4 | 15,400,000 |  |  |  |
Principal payment in year 5 | 15,400,000 |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 1.57%
Borrowings outstanding |  | 161,400,000 |  |  |
Bank guarantees |  |  |  |  |
Long-term debt |  |  |  |  |
Amount outstanding under credit facility |  | 5,600,000 |  |  |
Revolving credit facility |  |  |  |  |
Long-term debt |  |  |  |  |
Maximum borrowing capacity | 460,000,000 |  |  |  | $ 460,000,000
Borrowings outstanding |  | 195,000,000 |  |  |
Amount available for borrowing under facility |  | 264,000,000 |  |  |
Standby letters of credit |  |  |  |  |
Long-term debt |  |  |  |  |
Maximum borrowing capacity | 150,000,000 |  |  |  |
Letters of credit outstanding |  | 900,000 |  |  |
Swingline loans |  |  |  |  |
Long-term debt |  |  |  |  |
Maximum borrowing capacity | 20,000,000 |  |  |  |
Multicurrency borrowings and letter of credit |  |  |  |  |
Long-term debt |  |  |  |  |
Maximum borrowing capacity | $ 150,000,000 |  |  |  |
Letters of credit outstanding |  | $ 4,900,000 |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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