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Components of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Debt Instrument    
Total Debt $ 2,287,185us-gaap_LongTermDebt $ 2,358,000us-gaap_LongTermDebt
Less Current Portion 250,185us-gaap_LongTermDebtCurrent 80,728us-gaap_LongTermDebtCurrent
Effective Interest Rate 3.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage 3.86%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Total Long-Term Debt 2,037,000us-gaap_LongTermDebtNoncurrent 2,277,272us-gaap_LongTermDebtNoncurrent
Tranche B-1 Term Facility due April 2, 2016    
Debt Instrument    
Total Debt 229,185us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB1DueAprilSecondTwentySixteenMember
294,750us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB1DueAprilSecondTwentySixteenMember
Effective Interest Rate 3.18%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB1DueAprilSecondTwentySixteenMember
3.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB1DueAprilSecondTwentySixteenMember
Tranche B-2 Term Facility due April 2, 2020    
Debt Instrument    
Total Debt 2,058,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB2DueAprilSecondTwentyTwentyMember
2,063,250us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB2DueAprilSecondTwentyTwentyMember
Effective Interest Rate 4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB2DueAprilSecondTwentyTwentyMember
3.96%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= wtw_TermLoanB2DueAprilSecondTwentyTwentyMember
Revolving Facility due April 2, 2018    
Debt Instrument    
Total Debt $ 0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Effective Interest Rate 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember