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Intangible Assets (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Finite Lived Intangible Assets [Line Items]          
2018 (remaining nine months) $ 12,130   $ 12,130    
2019 22,088   22,088    
2020 21,091   21,091    
2021 16,359   16,359    
2022 7,433   7,433    
2023 and beyond 7,645   7,645    
Intangible assets, other than capitalized software development costs          
Gross carrying amount 152,640   152,640   $ 123,840
Accumulated amortization (65,894)   (65,894)   (54,627)
Net intangible assets 86,746   86,746   69,213
Amortization     $ 11,267,000 $ 11,378,000  
Document Period End Date     Sep. 30, 2017    
Operating Expense [Member]          
Finite Lived Intangible Assets [Line Items]          
2018 (remaining nine months) 3,874   $ 3,874    
2019 5,577   5,577    
2020 4,580   4,580    
2021 3,731   3,731    
2022 2,593   2,593    
2023 and beyond 6,056   6,056    
Intangible assets, other than capitalized software development costs          
Net intangible assets 26,411   26,411    
Cost of Sales [Member]          
Finite Lived Intangible Assets [Line Items]          
2018 (remaining nine months) 8,256   8,256    
2019 16,511   16,511    
2020 16,511   16,511    
2021 12,628   12,628    
2022 4,840   4,840    
2023 and beyond 1,589   1,589    
Intangible assets, other than capitalized software development costs          
Net intangible assets 60,335   60,335    
Customer Relationships [Member]          
Intangible assets, other than capitalized software development costs          
Gross carrying amount 54,450   54,450   50,550
Accumulated amortization (32,349)   (32,349)   (28,972)
Net intangible assets 22,101   22,101   21,578
Trade Name & Contracts [Member]          
Intangible assets, other than capitalized software development costs          
Gross carrying amount 7,080   7,080   5,480
Accumulated amortization (2,770)   (2,770)   (2,088)
Net intangible assets 4,310   4,310   3,392
Software Technology [Member]          
Intangible assets, other than capitalized software development costs          
Gross carrying amount 91,110   91,110   67,810
Accumulated amortization (30,775)   (30,775)   (23,567)
Net intangible assets 60,335   60,335   $ 44,243
Software Technology [Member] | Cost of Sales [Member]          
Intangible assets, other than capitalized software development costs          
Amortization 3,807,000 $ 3,030,000 7,208,000 6,057,000  
Customer relations, trade name and contracts [Member] | Operating Expense [Member]          
Intangible assets, other than capitalized software development costs          
Amortization $ 2,012,000 $ 2,617,000 $ 4,059,000 $ 5,321,000