($ in millions)
($ in millions)
($ in millions)
($ in millions)
Reporting Segment
Fiscal 2018 Net Sales
Fiscal 2017 Net Sales
% Inc (Dec)
Grocery & Snacks
$3,287.0
$3,208.8
2%
Refrigerated & Frozen
2,753.0
2,652.7
4%
International
843.5
816.0
3%
Foodservice
1,054.8
1,078.3
(2)%
Commercial
—
71.1
(100)%
Total
$7,938.3
$7,826.9
1%
fiscal 2018 compared to fiscal 2017 .
net sales .
overall our net sales were $ 7 .
94 billion in fiscal 2018 an increase of 1 % compared to fiscal 2017 .
grocery & snacks net sales for fiscal 2018 were $ 3 .
29 billion an increase of $ 78 .
2 million or 2 % compared to fiscal 2017 .
results reflected a decrease in volumes of approximately 2 % in fiscal 2018 compared to the prior-year period excluding the impact of acquisitions .
the decrease in sales volumes reflected a reduction in promotional intensity planned discontinuation of certain lower-performing products retailer inventory reductions which were higher than anticipated and deliberate actions to optimize distribution on certain lower-margin products consistent with the company ' s value over volume strategy .
price / mix was flat compared to the prior-year period as favorable mix improvements from recent innovation and higher net pricing nearly offset continued investments in retailer marketing to drive brand saliency enhanced distribution and consumer trial .
the acquisition of angie ' s artisan treats llc contributed $ 68 .
1 million to grocery & snacks net sales during fiscal 2018 .
the frontera acquisition contributed $ 8 .
6 million and the thanasi acquisition contributed $ 66 .
5 million to grocery & snacks net sales during fiscal 2018 through the one-year anniversaries of the acquisitions .
the frontera and thanasi acquisitions occurred in september 2016 and april 2017 respectively .
refrigerated & frozen net sales for fiscal 2018 were $ 2 .
75 billion an increase of $ 100 .
3 million or 4 % compared to fiscal 2017 .
results for fiscal 2018 reflected a 3 % increase in volume compared to fiscal 2017 excluding the impact of 31 acquisitions .
the increase in sales volumes was a result of brand renovation and innovation launches .
price / mix was flat compared to fiscal 2017 as favorability in both net pricing and mix offset continued investment in retailer marketing to drive brand saliency enhanced distribution and consumer trial .
the acquisition of the sandwich bros .
of wisconsin ® business contributed $ 21 .
3 million to refrigerated & frozen ' s net sales during fiscal 2018 .
the frontera acquisition which occurred in september 2016 and subsequent innovation in the frontera ® brand contributed $ 4 .
4 million during fiscal 2018 through the one-year anniversary of the acquisition .
international net sales for fiscal 2018 were $ 843 .
5 million an increase of $ 27 .
5 million or 3 % compared to fiscal 2017 .
results for fiscal 2018 reflected a 3 % decrease in volume a 3 % increase due to foreign exchange rates and a 3 % increase in price / mix in each case compared to fiscal 2017 .
the volume decrease for fiscal 2018 was driven by strategic decisions to eliminate lower margin products and to reduce promotional intensity .
the increase in price / mix compared to the prior-year period was driven by improvements in pricing and trade productivity .
foodservice net sales for fiscal 2018 were $ 1 .
05 billion a decrease of $ 23 .
5 million or 2 % compared to fiscal 2017 .
results for fiscal 2018 reflected an 11 % decrease in volume partially offset by a 9 % increase in price / mix compared to fiscal 2017 .
the decrease in volumes compared to the prior year primarily reflected the impact of exiting a non-core business the planned discontinuation of certain lower-performing businesses and softness in certain categories .
the increase in price / mix for fiscal 2018 reflected favorable product and customer mix the impact of inflation-driven increases in pricing and the execution of the segment ' s value over volume strategy .
in the first quarter of fiscal 2017 we divested our spicetec and jm swank businesses .
these businesses comprise the entire commercial segment following the presentation of lamb weston as discontinued operations .
accordingly there were no net sales in the commercial segment after the first quarter of fiscal 2017 .
these businesses had net sales of $ 71 .
1 million in fiscal 2017 prior to the completion of the divestitures .

Question: When did the Frontera acquisition occur?
Answer: September 2016