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Segment Information-Textual (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended
Mar. 29, 2015
Customer
Segment
Mar. 31, 2013
Jul. 01, 2012
Segment Reporting Information [Line Items]      
Number of reportable segments (segment) 2us-gaap_NumberOfReportableSegments    
Multiemployer pension plan withdrawal charge   $ 7.2hwkn_MultiemployerPensionPlanWithdrawalPreTaxCharge  
Number of customers representing 10% or more of revenue (customers) 0hwkn_EntityWideRevenueMajorCustomerNumberOfCustomers    
ICL Performance Products LP (ICL) [Member]      
Segment Reporting Information [Line Items]      
Legal settlement     $ 3.2us-gaap_LossContingencyLossInPeriod
/ us-gaap_LitigationCaseAxis
= hwkn_IclPerformanceProductsLpIclMember