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Basis of Presentation - Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Jul. 01, 2018
Jun. 30, 2018
Revenue Recognition                
Revenues $ 303,205   $ 277,528   $ 569,454 $ 534,661    
Costs of goods sold 192,861   175,898   363,197 341,760    
Operating expenses 78,637   83,483   158,293 155,360    
Income from operations 31,707   18,147   47,964 37,541    
Interest expense and other expense, net (5,620)   (5,282)   (10,952) (9,531)    
Income tax provision (6,980)   (59,816)   (8,503) (64,804)    
Net income (loss) 19,107 $ 9,402 $ (46,951) $ 10,157 28,509 $ (36,794)    
Assets                
Accounts receivable, net 226,086       226,086     $ 210,744
Inventories 315,200       315,200     313,552
Other assets 756,391       756,391      
Liabilities                
Current liabilities 469,914       469,914     443,322
Other liabilities 331,567       331,567      
Stockholders' Equity                
Retained earnings 363,254       363,254     334,745
Contract Assets                
Unbilled revenue 19,997       19,997     13,087
Contract Liabilities                
Advances from customers 69,410       69,410     55,761
Deferred revenue - current 32,516       32,516     28,899
Deferred revenue - long-term 8,883       8,883     9,562
Remaining Performance Obligations                
Revenue remaining performance obligation 162,300       $ 162,300      
Revenue, Practical Expedient, Financing Component [true false]         true      
Recently Adopted Accounting Pronouncements                
Prepaid expenses and other assets $ 43,949       $ 43,949     $ 41,587
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01                
Remaining Performance Obligations                
Remaining performance obligation expected timing of satisfaction period 12 months       12 months      
Remaining performance obligation expected percentage recognized 50.50%       50.50%      
ASU 2014-09 | Balances without Adoption of ASC 606                
Revenue Recognition                
Revenues $ 288,376       $ 551,043      
Costs of goods sold 185,133       354,290      
Operating expenses 74,690       152,118      
Income from operations 28,553       44,635      
Interest expense and other expense, net (5,620)       (10,952)      
Income tax provision (6,445)       (7,920)      
Net income (loss) 16,488       25,763      
Assets                
Accounts receivable, net 215,825       215,825      
Inventories 324,134       324,134      
Other assets 756,975       756,975      
Liabilities                
Current liabilities 471,917       471,917      
Other liabilities 331,567       331,567      
Stockholders' Equity                
Retained earnings 360,508       360,508      
ASU 2014-09 | Effect of Change                
Revenue Recognition                
Revenues 14,829       18,411      
Costs of goods sold 7,728       8,907      
Operating expenses 3,947       6,175      
Income from operations 3,154       3,329      
Income tax provision (535)       (583)      
Net income (loss) 2,619       2,746      
Assets                
Accounts receivable, net 10,261       10,261      
Inventories (8,934)       (8,934)      
Other assets (584)       (584)      
Liabilities                
Current liabilities (2,003)       (2,003)      
Stockholders' Equity                
Retained earnings 2,746       2,746      
Contract Assets                
Unbilled revenue 6,910       $ 6,910      
Percentage of change in unbilled revenue         53.00%      
Contract Liabilities                
Advances from customers 13,649       $ 13,649      
Deferred revenue - current 3,617       3,617      
Deferred revenue - long-term $ (679)       $ (679)      
Percentage of of change in customer deposits and prepayments         24.00%      
Percentage of change deferred revenue current         13.00%      
Percentage of change deferred revenue noncurrent         (7.00%)      
ASU 2016-16                
Recently Adopted Accounting Pronouncements                
Prepaid expenses and other assets             $ (3,000)  
Deferred tax asset             $ 3,000