Returning NRI

I am working with Fujitsu Consulting India. I have joined Fujitsu India in Dec 2013.
I left for Qatar in Jan 2014 for a customer of my company.
From Salary point of view, I used to get salary in Indian bank account and per Diem for onsite allowance. (onsite expense allowance)
I have paid income tax for the salary paid in Indian account.
In September 2014, I got resident permit from country of Qatar. And from that month onward, I started getting salary from my company in Qatar bank account. From September 2014 onward, I stopped paying income tax in India.
There is no tax in Doha, Qatar on income.
My tax liability for financial year 2014-15 was on salary what I received in India from April 2014 till August 2014.
I am still getting salary in Qatar bank account. For the financial year 2015-16, starting from April 2015 till October 2015, I have received the salary in Qatar bank account. And hence I have not paid any tax in India till now.
I am out of the country from 05 January 2014. From that day till today, I was in India for only 63 days in all (not in one stretch, but in 4 different breaks).
For this financial year (2015-16) at the end of October 2015, I would be out for 213 days from India.
My confusion is, once I come back from Qatar to India and I start getting salary in Indian account, do I need to pay taxes in India for months  (April 2015 till October 2015) which I have earned in Doha ?
What is withholding tax from employee and employer point of view?