Summary of Derivative Financial Instruments Related Fair Value and Balance Sheet Classification (Detail) | 2-May-15 | 3-May-14 | 2-May-15 | 3-May-14 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 2-May-15 | 2-May-15 | 3-May-14 | 3-May-14 | 2-May-15 | 2-May-15 | 2-May-15 | 3-May-14 | 3-May-14 | 3-May-14 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 2-May-15 | 3-May-14 | 3-May-14 | 3-May-14 | 2-May-15 | 2-May-15 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 | 3-May-14 |
In Thousands, unless otherwise specified | USD ($) | USD ($) | Diesel Fuel Contracts | Diesel Fuel Contracts | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Intercompany Balances, Primarily Short-Term Debt And Related Interest | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Merchandise Purchase Commitments | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest | Intercompany Balances, Primarily And Related Interest |
| | | (Accrued Expense) | (Accrued Expense) | (Accrued Expense) | (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense | Prepaid Expense | Prepaid Expense | Prepaid Expense | Prepaid Expense | (Accrued Expense) | (Accrued Expense) | (Accrued Expense) | (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | (Accrued Expense) | (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense / (Accrued Expense) | Prepaid Expense | Prepaid Expense |
| | | USD ($) | USD ($) | Conversion Of US Dollar To Pound | Conversion Of US Dollar To Pound | Conversion Of Zloty To Canadian Dollar | Conversion Of Zloty To Canadian Dollar | Conversion Of Zloty To Canadian Dollar | Conversion Of Euro To Pound | Conversion Of Euro To Pound | Conversion Of Euro To Pound | Conversion Of Euro To US Dollar | Conversion Of Euro To US Dollar | Conversion Of Pound To US Dollar | Conversion Of Pound To US Dollar | Conversion of Us Dollar to Yen | Conversion of Us Dollar to Yen | Conversion Of Canadian Dollar To US Dollar | Conversion Of Canadian Dollar To US Dollar | Conversion Of Canadian Dollar To US Dollar | Conversion Of Canadian Dollar To US Dollar | Conversion Of Canadian Dollar To Euro | Conversion Of Canadian Dollar To Euro | Conversion Of Canadian Dollar To Euro | Conversion Of Canadian Dollar To Euro | Conversion Of Canadian Dollar To Euro | Conversion Of Canadian Dollar To Euro | Conversion Of Pound To US Dollar | Conversion Of Pound To US Dollar | Conversion Of Zloty To Pound | Conversion Of Zloty To Pound | Conversion Of Zloty To Pound | Conversion Of Zloty To Pound | Conversion Of Zloty To Pound | Conversion Of Zloty To Pound | Conversion Of US Dollar To Euro | Conversion Of US Dollar To Euro | Conversion Of US Dollar To Euro | Conversion Of US Dollar To Euro | Conversion Of Euro To US Dollar | Conversion Of Euro To US Dollar | Conversion Of Zloty To Canadian Dollar | Conversion Of Zloty To Canadian Dollar | Conversion Of Zloty To Canadian Dollar | Conversion Of Euro To Pound | Conversion Of Euro To Pound | Conversion Of Euro To Pound | Conversion Of US Dollar To Pound | Conversion Of US Dollar To Pound |
| | | | | USD ($) | GBP (£) | USD ($) | CAD | PLN | USD ($) | EUR (€) | GBP (£) | USD ($) | EUR (€) | USD ($) | GBP (£) | USD ($) | JPY (¥) | USD ($) | CAD | USD ($) | CAD | USD ($) | CAD | EUR (€) | USD ($) | CAD | EUR (€) | USD ($) | GBP (£) | USD ($) | GBP (£) | PLN | USD ($) | GBP (£) | PLN | USD ($) | EUR (€) | USD ($) | EUR (€) | USD ($) | EUR (€) | USD ($) | CAD | PLN | USD ($) | EUR (€) | GBP (£) | USD ($) | GBP (£) |
Derivatives, Fair Value [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Economic hedges for which hedge accounting was not elected, Diesel contracts, Pay | | | Fixed on 2.6M - 3.0M gal per month | Fixed on 1.6M - 1.8M gal per month | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Hedge accounting not elected, Pay | | | | | $83,400 | | | | 94,073 | | € 39,000 | | | € 19,850 | | £ 145,258 | $844 | | | 461,464 | | 411,075 | | 14,596 | | | 15,483 | | | £ 167,715 | | | 169,058 | | | 128,099 | $22,198 | | $23,376 | | | € 44,850 | | | 87,073 | | € 39,000 | | $90,309 | |
Economic hedges for which hedge accounting was not elected, Diesel contracts, Receive | | | Float on 2.6M - 3.0M gal per month | Float on 1.6M - 1.8M gal per month | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Hedge accounting not elected, Receive | | | | | | 55,000 | | 32,344 | | | | 30,988 | 22,647 | | 236,200 | | | 5,138 | 375,455 | | 374,675 | | | | 10,500 | | | 10,200 | 256,000 | | | 30,156 | | | 25,079 | | | 20,228 | | 17,001 | 61,842 | | | 30,585 | | | | 32,369 | | 55,000 |
Blended Contract Rate | | | | | 0.6595 | 0.6595 | 0.3438 | 0.3438 | 0.3438 | 0.7946 | 0.7946 | 0.7946 | 1.1409 | 1.1409 | 1.6261 | 1.6261 | 6.0877 | 6.0877 | 0.8136 | 0.8136 | 0.9115 | 0.9115 | 0.7194 | 0.7194 | 0.7194 | 0.6588 | 0.6588 | 0.6588 | 1.5264 | 1.5264 | 0.1784 | 0.1784 | 0.1784 | 0.1958 | 0.1958 | 0.1958 | 0.9113 | 0.9113 | 0.7273 | 0.7273 | 1.3789 | 1.3789 | 0.3513 | 0.3513 | 0.3513 | 0.83 | 0.83 | 0.83 | 0.609 | 0.609 |
Current Asset | 11,865 | 7,662 | | 1,001 | | | 801 | | | 3,165 | | | 314 | | | | | | 3,200 | | 3,346 | | 54 | | | 56 | | | 3,637 | | 57 | | | 265 | | | 637 | | 207 | | | | 26 | | | 513 | | | 2,248 | |
Current (Liability) | -17,309 | -12,463 | -7,311 | | -223 | | -13 | | | | | | | | -8,698 | | -24 | | -6,926 | | -2,621 | | -297 | | | -8 | | | -1,603 | | -773 | | | -54 | | | -163 | | -8 | | -350 | | -651 | | | -49 | | | | |
Net Fair Value | ($5,444) | ($4,801) | ($7,311) | $1,001 | ($223) | | $788 | | | $3,165 | | | $314 | | ($8,698) | | ($24) | | ($3,726) | | $725 | | ($243) | | | $48 | | | $2,034 | | ($716) | | | $211 | | | $474 | | $199 | | ($350) | | ($625) | | | $464 | | | $2,248 | |