XML 38 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Borrowing Arrangements (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Sep. 30, 2013 | Jun. 30, 2014 Swing Line Loans [Member] | Jun. 30, 2014 Letters Of Credit Outstanding [Member] | Jun. 30, 2014 Eight Point Seven Five Senior Unsecured Notes [Member] | Jun. 30, 2014 Seven Point Three Seven Five Senior Subordinated Notes [Member] | Jun. 30, 2014 ABL Agreement [Member] | Jun. 30, 2014 Minimum [Member] | Jun. 30, 2014 Maximum [Member] | Jun. 30, 2014 Change in Control [Member] Eight Point Seven Five Senior Unsecured Notes [Member] | Jun. 30, 2014 Change in Control [Member] Seven Point Three Seven Five Senior Subordinated Notes [Member] | Jun. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Minimum [Member] | Jun. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Maximum [Member] | Jun. 30, 2014 Base Rate [Member] Minimum [Member] | Jun. 30, 2014 Base Rate [Member] Maximum [Member] | Aug. 29, 2014 Subsequent Event [Member] | Aug. 29, 2014 Subsequent Event [Member] Seven Point Three Seven Five Senior Subordinated Notes [Member]
Revolving credit facility amount |  |  |  |  |  |  | $ (25) | $ (60) |  |  | $ (225) |  |  |  |  |  |  |  |  |  |
Potential increase size of the credit facility by an additional amount |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |  |
Borrowing rate in addition to LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17500.00% | 22500.00% | 7500.00% | 12500.00% |  |
Line of Credit Facility, Interest Rate at Period End | 17500.00% |  |  | 17500.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement termination date |  |  |  | Dec. 18, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate commitments availability |  |  |  |  |  |  |  |  |  |  | 22.5 |  |  |  |  |  |  |  |  |  |
Aggregate commitments availability, percentage |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Outstanding letter of credit accrued fees and expenses |  |  |  |  |  |  |  |  |  |  | 29.1 |  |  |  |  |  |  |  |  |  |
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses |  |  |  |  |  |  |  |  |  |  | 161.5 |  |  |  |  |  |  |  |  |  |
Senior subordinated notes bear interest |  |  |  |  |  |  |  |  | 8.75% | 7.375% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  | Sep. 01, 2020 | Jun. 01, 2017 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  |  |  |  |  |  |  | 3750.00% | 2500.00% | 3750.00% |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  | 1.8 |  |  |  |  |  |  |  |  |  |  |  |
Subordinated notes fair value |  |  |  |  |  |  |  |  | 199.4 | 426.3 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% | 101.00% |  |  |  |  |  | 101.229%
Debt Instrument, Redemption Period, Start Date |  |  |  | Aug. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  | 22.5 |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.0 |
Gains (Losses) on Extinguishment of Debt | $ 0 | $ 0 | $ (1.4) | $ 0 | $ (1.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.0) |

X
- Definition Maximum excess availability level at which financial maintenance covenants would apply. + References No definition available. + Details
Name: | mwa_MaximumExcessAvailabilityLevelAtWhichFinancialMaintenanceCovenantsWouldApply
Namespace Prefix: | mwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum excess availability level at which financial maintenance covenants would apply, as a percentage of aggregate commitments. + References No definition available. + Details
Name: | mwa_MaximumExcessAvailabilityLevelAtWhichFinancialMaintenanceCovenantsWouldApplyAsPercentageOfAggregateCommitments
Namespace Prefix: | mwa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total other amounts reducing excess availability. + References No definition available. + Details
Name: | mwa_OutstandingLetterOfCreditAccruedFeesAndExpenses
Namespace Prefix: | mwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Potential increase in the size of credit facility. + References No definition available. + Details
Name: | mwa_PotentialIncreaseInSizeOfCreditFacility
Namespace Prefix: | mwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Start date of debt instrument redemption period, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodStartDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration