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Common Stock and Stock-Based Awards (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Share-Based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock available for issuance 758,104us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant   757,588us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Number Of Outstanding Options 11,727us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions    
Weighted average exercise price, Outstanding at end of year $ 17.50us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1    
Award expiration period 10 years    
Stock option grants 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Compensation Expense $ 1,442us-gaap_AllocatedShareBasedCompensationExpense $ 1,105us-gaap_AllocatedShareBasedCompensationExpense  
Employee Stock Purchase Plan Discount Rate 95.00%mwiv_EmployeeStockPurchasePlanDiscountRate    
Employee Stock Purchase Plan Payroll Deduction Rate Minimum 1.00%mwiv_EmployeeStockPurchasePlanPayrollDeductionRateMinimum    
Employee Stock Purchase Plan Payroll Deduction Rate Maximum 10.00%mwiv_EmployeeStockPurchasePlanPayrollDeductionRateMaximum    
Employee Stock Purchase Plan Annual Limit $ 20mwiv_EmployeeStockPurchasePlanAnnualLimit    
Maximum shares per purchase period 200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee    
Restricted Stock [Member]      
Share-Based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued during the period 450us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
3,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
ESPP [Member]      
Share-Based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued during the period 1,511us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
1,097us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember