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v2.4.1.9

Warranties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Feb. 28, 2015 | May 31, 2014
Warranties [Line Items] |  |
Warranty term, minimum | 1 year |
Warranty term, maximum | 3 years |
Warranty reserves | $ 0.2 rell_WarrantyReserves | $ 0.2 rell_WarrantyReserves

X
- Details
Name: | rell_WarrantiesLineItems
Namespace Prefix: | rell_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warranty period, minimum. + References No definition available. + Details
Name: | rell_WarrantyPeriodMinimum
Namespace Prefix: | rell_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warranty reserves. + References No definition available. + Details
Name: | rell_WarrantyReserves
Namespace Prefix: | rell_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Warranty term, maximum. + References No definition available. + Details
Name: | rell_WarrantyTermMaximum
Namespace Prefix: | rell_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration