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Decile means one of the ten groups containing an equal number of the items that make up a frequency distribution.
where you take away the 10% of the data from 90% of the data
The first decile (D1) is a number such that one tenth of the observations are smaller and nine tenths are larger. The ninth decile (D9) is a number such that nine tenths of the observations are smaller and one tenth are larger. The interdecile range is D9 - D1
If by "over a third" you mean divided by a third, then the answer is 3 times. If by "over a third" you mean greater than a third, then 0.4, 0.5, 0.6 etc will do.
One third in numbers is 1/3.