Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements Fair Value Measurements Text (Details)

v2.4.1.9
Fair Value Measurements Fair Value Measurements Text (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 1.3wstl_BusinessCombinationContingentConsiderationArrangementsRangeNetOfOutcomesValueLow
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 2.7wstl_BusinessCombinationContingentConsiderationArrangementsNetRangeOfOutcomesValueHigh