Consolidated Statements of Operations - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Jun. 30, 2015
Feb. 01, 2015
Jun. 30, 2017
Jun. 30, 2016
Revenue        
Product $ 848.0   $ 2,373.2 $ 2,319.8
Service 137.5   444.4 395.1
Total revenue 985.5   2,817.6 2,714.9
Cost of revenue        
Product 679.9   1,884.2 1,866.5
Service 108.6   347.5 307.8
Total cost of revenue 788.5   2,231.7 2,174.3
Gross margin 197.0   585.9 540.6
Operating expenses        
Selling expenses 94.4   276.2 248.2
General and administrative expenses 40.5   105.0 96.9
Transaction costs 21.3   14.8 20.6
Depreciation and amortization 30.2   81.8 76.0
Total operating expenses 186.4   477.8 441.7
Operating income 10.6   108.1 98.9
Interest and other (income) expense        
Interest expense 46.7   72.5 81.9
Loss on disposal of business 0.0   0.0 6.8
Loss on extinguishment of debt 0.7   28.5 9.7
Other (income) expense, net 0.1   0.1 0.1
Total interest and other (income) expense 47.5   101.1 98.5
Income (loss) before income taxes (36.9)   7.0 0.4
Income tax expense (benefit) (12.6)   2.6 3.8
Net income (loss) $ (24.3)   $ 4.4 $ (3.4)
Earnings (loss) per share:        
Basic (in dollars per share) $ (0.35)   $ 0.06 $ (0.05)
Diluted (in dollars per share) $ (0.35)   $ 0.05 $ (0.05)
Weighted-average common shares outstanding:        
Basic (in shares) 70,010,538   77,517,700 71,117,962
Diluted (in shares) 70,010,538   81,861,839 71,117,962
Predecessor [Member]        
Revenue        
Product   $ 1,201.4    
Service   191.4    
Total revenue   1,392.8    
Cost of revenue        
Product   952.9    
Service   150.6    
Total cost of revenue   1,103.5    
Gross margin   289.3    
Operating expenses        
Selling expenses   137.6    
General and administrative expenses   59.9    
Transaction costs   42.6    
Depreciation and amortization   22.4    
Total operating expenses   262.5    
Operating income   26.8    
Interest and other (income) expense        
Interest expense   21.4    
Loss on disposal of business   0.0    
Loss on extinguishment of debt   7.5    
Other (income) expense, net   (0.2)    
Total interest and other (income) expense   28.7    
Income (loss) before income taxes   (1.9)    
Income tax expense (benefit)   3.2    
Net income (loss)   $ (5.1)    
Earnings (loss) per share:        
Basic (in dollars per share)   $ (0.01)    
Diluted (in dollars per share)   $ (0.01)    
Weighted-average common shares outstanding:        
Basic (in shares)   561,886,602    
Diluted (in shares)   561,886,602