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Note 14 - Segment Reporting (Details) - Segment Reporting (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2015 | Mar. 01, 2014 | Feb. 28, 2015 | Mar. 01, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 361,462 us-gaap_Revenues |  | $ 343,967 us-gaap_Revenues | $ 731,823 us-gaap_Revenues | $ 690,671 us-gaap_Revenues
Income (loss) from operations | 41,551 us-gaap_OperatingIncomeLoss |  | 40,724 us-gaap_OperatingIncomeLoss | 102,140 us-gaap_OperatingIncomeLoss | 96,364 us-gaap_OperatingIncomeLoss
Interest (income) expense, net | (705)us-gaap_InterestIncomeExpenseNet |  | (661)us-gaap_InterestIncomeExpenseNet | (1,321)us-gaap_InterestIncomeExpenseNet | (1,218)us-gaap_InterestIncomeExpenseNet
Income (loss) before taxes | 41,376 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 41,224 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 102,210 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 97,580 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
U.S. And Canadian Rental And Cleaning [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 327,950 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember |  | 309,342 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | 658,851 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | 617,784 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember
Income (loss) from operations | 51,691 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember |  | 46,794 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | 114,990 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | 105,153 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember
Interest (income) expense, net | (901)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember |  | (865)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | (1,671)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | (1,595)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember
Income (loss) before taxes | 52,605 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember |  | 47,640 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | 116,689 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember | 106,727 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_USAndCanadianRentalAndCleaningMember
MFG [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 50,844 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember |  | 42,101 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember | 102,672 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember | 86,334 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember
Income (loss) from operations | 17,003 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember |  | 14,299 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember | 35,234 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember | 29,873 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember
Income (loss) before taxes | 17,054 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember |  | 14,270 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember | 35,326 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember | 29,763 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_MFGMember
Net Interco MFG Elimination [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (50,844)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember |  | (42,101)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember | (102,672)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember | (86,334)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember
Income (loss) from operations | (443)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember |  | 362 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember | (2,132)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember | (902)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember
Income (loss) before taxes | (443)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember |  | 362 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember | (2,132)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember | (902)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_NetIntercoMFGEliminationMember
Corporate Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 4,118 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 3,839 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 9,064 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 7,403 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Income (loss) from operations | (27,327)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [1] | (22,012)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (50,295)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (42,309)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Interest (income) expense, net | 196 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 204 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 350 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 377 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Income (loss) before taxes | (27,654)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | (22,266)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (50,901)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (42,735)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Subtotal Core Laundry Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 332,068 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember |  | 313,181 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | 667,915 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | 625,187 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember
Income (loss) from operations | 40,924 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember |  | 39,443 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | 97,797 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | 91,815 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember
Interest (income) expense, net | (705)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember |  | (661)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | (1,321)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | (1,218)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember
Income (loss) before taxes | 41,562 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember |  | 40,006 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | 98,982 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember | 92,853 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SubtotalCoreLaundryOperationsMember
Specialty Garments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 18,661 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember |  | 20,406 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember | 41,137 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember | 44,849 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember
Income (loss) from operations | (435)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember |  | 312 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember | 1,833 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember | 3,071 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember
Income (loss) before taxes | (1,248)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember |  | 249 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember | 718 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember | 3,249 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_SpecialtyGarmentsMember
First Aid [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 10,733 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember |  | 10,380 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember | 22,771 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember | 20,635 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember
Income (loss) from operations | 1,062 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember |  | 969 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember | 2,510 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember | 1,478 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember
Income (loss) before taxes | $ 1,062 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember |  | $ 969 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember | $ 2,510 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember | $ 1,478 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = unf_FirstAidMember
[1] | The Company increased its environmental contingency reserves during its second fiscal quarter of 2015 by $3.6 million. This increase was due mainly to additional costs the Company expects to incur associated with the construction of a planned municipal transit station in the area of its Somerville site. To a lesser extent, the Company's reserves also were increased due to the effect of lower interest rates on the discounting of its environmental liabilities.

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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