Annual report pursuant to Section 13 and 15(d)

Segment Information (Details 1)

v3.8.0.1
Segment Information (Details 1)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Verizon [Member]    
Revenue, Major Customer [Line Items]    
Percentage Of Net Revenue 18.00% 21.90%
AT&T [Member]    
Revenue, Major Customer [Line Items]    
Percentage Of Net Revenue 12.50% 16.30%
AmericanTower [Member]    
Revenue, Major Customer [Line Items]    
Percentage Of Net Revenue 7.20% 10.00%